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_36BIT_NOR_defconfig b/configs/P1010RDB-PA_36BIT_NOR_defconfig
index cf42d2f..3b6f420 100644
--- a/configs/P1010RDB-PA_36BIT_NOR_defconfig
+++ b/configs/P1010RDB-PA_36BIT_NOR_defconfig
@@ -1,12 +1,11 @@
 CONFIG_PPC=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_P1010RDB=y
+CONFIG_TARGET_P1010RDB_PA=y
 CONFIG_PHYS_64BIT=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"
 CONFIG_BOOTDELAY=10
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_HUSH_PARSER=y