config: Update several config files to use board aliases for lcd

Add a sample-lcd.cfg with the defintions for several common "reprap"
style LCD displays that use the EXP1/EXP2 plugs.  Update several
config files to add EXP1/EXP2 board aliases.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

config/generic-bigtreetech-skr-v1.3.cfg

@@ -134,9 +134,9 @@ max_z_accel: 100
 
 #[tmc2130 stepper_x]
 #cs_pin: P1.17
-#spi_software_sclk_pin: P0.4
-#spi_software_mosi_pin: P4.28
 #spi_software_miso_pin: P0.5
+#spi_software_mosi_pin: P4.28
+#spi_software_sclk_pin: P0.4
 ##diag1_pin: P1.29
 #microsteps: 16
 #run_current: 0.800
@@ -145,9 +145,9 @@ max_z_accel: 100
 
 #[tmc2130 stepper_y]
 #cs_pin: P1.15
-#spi_software_sclk_pin: P0.4
-#spi_software_mosi_pin: P4.28
 #spi_software_miso_pin: P0.5
+#spi_software_mosi_pin: P4.28
+#spi_software_sclk_pin: P0.4
 ##diag1_pin: P1.27
 #microsteps: 16
 #run_current: 0.800
@@ -156,9 +156,9 @@ max_z_accel: 100
 
 #[tmc2130 stepper_z]
 #cs_pin: P1.10
-#spi_software_sclk_pin: P0.4
-#spi_software_mosi_pin: P4.28
 #spi_software_miso_pin: P0.5
+#spi_software_mosi_pin: P4.28
+#spi_software_sclk_pin: P0.4
 ##diag1_pin: P1.25
 #microsteps: 16
 #run_current: 0.650
@@ -167,9 +167,9 @@ max_z_accel: 100
 
 #[tmc2130 extruder]
 #cs_pin: P1.8
-#spi_software_sclk_pin: P0.4
-#spi_software_mosi_pin: P4.28
 #spi_software_miso_pin: P0.5
+#spi_software_mosi_pin: P4.28
+#spi_software_sclk_pin: P0.4
 ##diag1_pin: P1.28
 #microsteps: 16
 #run_current: 0.800
@@ -178,9 +178,9 @@ max_z_accel: 100
 
 #[tmc2130 extruder1]
 #cs_pin: P1.1
-#spi_software_sclk_pin: P0.4
-#spi_software_mosi_pin: P4.28
 #spi_software_miso_pin: P0.5
+#spi_software_mosi_pin: P4.28
+#spi_software_sclk_pin: P0.4
 ##diag1_pin: P1.26
 #microsteps: 16
 #run_current: 0.800
@@ -189,63 +189,17 @@ max_z_accel: 100
 
 
 ########################################
-# Optional LCD configuration
+# EXP1 / EXP2 (display) pins
 ########################################
 
-# "RepRapDiscount 128x64 Full Graphic Smart Controller" type displays
-#[display]
-#lcd_type: st7920
-#cs_pin: P1.19
-#sclk_pin: P1.20
-#sid_pin: P1.18
-#encoder_pins: ^P3.26, ^P3.25
-#click_pin: ^!P0.28
-#
-#[output_pin beeper]
-#pin: P1.30
+[board_pins]
+aliases:
+    # EXP1 header
+    EXP1_1=P1.30, EXP1_3=P1.18, EXP1_5=P1.20, EXP1_7=P1.22, EXP1_9=<GND>,
+    EXP1_2=P0.28, EXP1_4=P1.19, EXP1_6=P1.21, EXP1_8=P1.23, EXP1_10=<5V>,
+    # EXP2 header
+    EXP2_1=P0.17, EXP2_3=P3.26, EXP2_5=P3.25, EXP2_7=P1.31, EXP2_9=<GND>,
+    EXP2_2=P0.15, EXP2_4=P0.16, EXP2_6=P0.18, EXP2_8=<RST>, EXP2_10=<NC>
+    # Pins EXP2_1, EXP2_6, EXP2_2 are also MISO, MOSI, SCK of bus "ssp0"
 
-# "RepRapDiscount 2004 Smart Controller" type displays
-#[display]
-#lcd_type: hd44780
-#rs_pin: P1.19
-#e_pin: P1.18
-#d4_pin: P1.20
-#d5_pin: P1.21
-#d6_pin: P1.22
-#d7_pin: P1.23
-#encoder_pins: ^P3.26, ^P3.25
-#click_pin: ^!P0.28
-#
-#[output_pin beeper]
-#pin: P1.30
-
-# 128x64 Full Graphic Creality CR10 / ENDER 3 stockdisplay
-#[display]
-#lcd_type: st7920
-#cs_pin: P1.19
-#sclk_pin: P1.21
-#sid_pin: P1.23
-#encoder_pins: ^P1.18, ^P1.20
-#click_pin: !P0.28
-#
-#[output_pin beeper]
-#pin: P1.30
-
-# MKS Mini 12864 LCD.
-# Make sure that the EXP1 and EXP2 are rotated correctly on the
-# display board. The cutouts on the connectors should be towards the
-# center of the PCB. See:
-#   https://reprap.org/wiki/MKS_MINI_12864#Physical_Interface
-# If they are wrong, the connector housing can be pried off carefully
-# with a small screwdriver and relocated the correct way.
-#
-#[display]
-#lcd_type: uc1701
-#cs_pin: P1.21
-#a0_pin: P1.22
-#contrast: 40
-#encoder_pins: ^P3.25, ^P3.26
-#click_pin: ^!P0.28
-#
-#[output_pin beeper]
-#pin: P1.30
+# See the sample-lcd.cfg file for definitions of common LCD displays.