nand: S4D adds partitions abnormally [1/1]

PD#SWPL-190919

Problem:
1.mistakes from SWPL-181442

T6D boot partition name: "bootloader" -> "bl2"

When S4 platform adding normal partitions,
partition with name "bl2e" will be matched
to process of add boot partitions.

2.inconsistent backups

Solution:
1.use strcmp replace strncmp
2.changes to 8 backups for S4D

Verify:
S4D

Change-Id: Ia0dee5e3397c529d6199495c24084150d24efba1
Signed-off-by: Feng Chen <feng.chen@amlogic.com>

arch/arm/boot/dts/amlogic/s4d_s805c3_aq2432_512m.dts

@@ -1388,6 +1388,7 @@
 	fip_size = <0x200000>;
 	ship_bad_block = <1>;
 	disa_irq_flag = <1>;
+	bl2ex_8_copies;
 	nand@bootloader {
 		reg = <0>;
 		#address-cells = <1>;

drivers/mtd/nand/meson_parse_part.c

@@ -220,7 +220,7 @@ static int parse_meson_partitions(struct mtd_info *master,
 	i = 0;
 	if (!strncmp((char *)parts[i].name, NAND_BOOT_NAME,
 		     strlen((const char *)NAND_BOOT_NAME)) ||
-	    !strncmp((char *)parts[i].name, "bl2", 3)) {
+	    !strcmp((char *)parts[i].name, "bl2")) {
 		parts[i].offset = 0;
 		if (!parts[i].size)
 			parts[i].size = ((uint64_t)master->writesize * BOOT_TOTAL_PAGES);