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/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index 9b6dd34..89573f8 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -94,8 +94,14 @@
 	bool "Support MPC8572DS"
 	select ARCH_MPC8572
 
-config TARGET_P1010RDB
-	bool "Support P1010RDB"
+config TARGET_P1010RDB_PA
+	bool "Support P1010RDB_PA"
+	select ARCH_P1010
+	select SUPPORT_SPL
+	select SUPPORT_TPL
+
+config TARGET_P1010RDB_PB
+	bool "Support P1010RDB_PB"
 	select ARCH_P1010
 	select SUPPORT_SPL
 	select SUPPORT_TPL