powerpc: T104XRDB: Split to T1040RDB and T1042RDB in Kconfig

Split ARCH_T104XRDB as ARCH_T1040RDB and ARCH_T1042RDB in Kconfig to
simplify config options.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index 48447c9..a404356 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -211,8 +211,13 @@
 	bool "Support T1040QDS"
 	select PHYS_64BIT
 
-config TARGET_T104XRDB
-	bool "Support T104xRDB"
+config TARGET_T1040RDB
+	bool "Support T1040RDB"
+	select SUPPORT_SPL
+	select PHYS_64BIT
+
+config TARGET_T1042RDB
+	bool "Support T1042RDB"
 	select SUPPORT_SPL
 	select PHYS_64BIT