powerpc: SECURE BOOT- Add secure boot target for T1042RDB

Secure boot target is added for T1042RDB platform.

Signed-off-by: Gaurav Rana <gaurav.rana@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

board/freescale/t104xrdb/MAINTAINERS

@@ -21,3 +21,4 @@ T1040RDB_SECURE_BOOT BOARD
 M:	Aneesh Bansal  <aneesh.bansal@freescale.com>
 S:	Maintained
 F:	configs/T1040RDB_SECURE_BOOT_defconfig
+F:	configs/T1042RDB_SECURE_BOOT_defconfig

configs/T1042RDB_SECURE_BOOT_defconfig

+CONFIG_SYS_EXTRA_OPTIONS="PPC_T1042,SECURE_BOOT,T1042RDB"
+CONFIG_PPC=y
+CONFIG_MPC85xx=y
+CONFIG_TARGET_T104XRDB=y