powerpc/mpc85xx: SECURE BOOT- Add secure boot target for P5040DS

Secure boot target is added for P5040DS platform.

Signed-off-by: Gaurav Rana <gaurav.rana@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/configs/P5040DS_SECURE_BOOT_defconfig b/configs/P5040DS_SECURE_BOOT_defconfig
new file mode 100644
index 0000000..8e21ca5
--- /dev/null
+++ b/configs/P5040DS_SECURE_BOOT_defconfig
@@ -0,0 +1,4 @@
+CONFIG_SYS_EXTRA_OPTIONS="SECURE_BOOT"
+CONFIG_PPC=y
+CONFIG_MPC85xx=y
+CONFIG_TARGET_P5040DS=y