sam3: Rename src/sam3x8e to src/sam3

This is in preparation for merging sam3 and sam4 code into one
directory.

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

src/sam3/Kconfig

@@ -0,0 +1,29 @@
+# Kconfig settings for SAM3 processors
+
+if MACH_SAM3X8E
+
+config SAM_SELECT
+    bool
+    default y
+    select HAVE_GPIO
+    select HAVE_GPIO_ADC
+    select HAVE_GPIO_SPI
+    select HAVE_GPIO_BITBANGING
+
+config BOARD_DIRECTORY
+    string
+    default "sam3"
+
+config CLOCK_FREQ
+    int
+    default 42000000 # 84000000/2
+
+config SERIAL
+    bool
+    default y
+config SERIAL_BAUD
+    depends on SERIAL
+    int "Baud rate for serial port"
+    default 250000
+
+endif