powerpc: P1010RDB: Remove macros CONFIG_P1010RDB_PA and CONFIG_P1010RDB_PB

Remove CONFIG_P1010RDB_PA and CONFIG_P1010RDB_PB and split TARGET_P1010RDB
to TARGET_P1010RDB_PA and TARGET_P1010RDB_PB in Kconfig.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/configs/P1010RDB-PA_NAND_defconfig b/configs/P1010RDB-PA_NAND_defconfig
index f6943a8..09a97ad 100644
--- a/configs/P1010RDB-PA_NAND_defconfig
+++ b/configs/P1010RDB-PA_NAND_defconfig
@@ -3,12 +3,12 @@
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL_DRIVERS_MISC_SUPPORT=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_P1010RDB=y
+CONFIG_TARGET_P1010RDB_PA=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-CONFIG_SYS_EXTRA_OPTIONS="P1010RDB_PA,NAND"
+CONFIG_SYS_EXTRA_OPTIONS="NAND"
 CONFIG_BOOTDELAY=10
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SPL=y