powerpc: B4420QDS: Split from B4860QDS in Kconfig

Use TARGET_B4420QDS to simplify Kconfig options.
Signed-off-by: NYork Sun <york.sun@nxp.com>

arch/powerpc/cpu/mpc85xx/Kconfig

@@ -16,6 +16,11 @@ config TARGET_SOCRATES
 	bool "Support socrates"
 	select ARCH_MPC8544
 
+config TARGET_B4420QDS
+	bool "Support B4420QDS"
+	select SUPPORT_SPL
+	select PHYS_64BIT
+
 config TARGET_B4860QDS
 	bool "Support B4860QDS"
 	select SUPPORT_SPL

board/freescale/b4860qds/Kconfig

-if TARGET_B4860QDS
+if TARGET_B4860QDS || TARGET_B4420QDS
 
 config SYS_BOARD
 	default "b4860qds"

configs/B4420QDS_NAND_defconfig

@@ -7,7 +7,7 @@ CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_DRIVERS_MISC_SUPPORT=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_B4860QDS=y
+CONFIG_TARGET_B4420QDS=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y

configs/B4420QDS_SPIFLASH_defconfig

 CONFIG_PPC=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_B4860QDS=y
+CONFIG_TARGET_B4420QDS=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y

configs/B4420QDS_defconfig

 CONFIG_PPC=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_B4860QDS=y
+CONFIG_TARGET_B4420QDS=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y