warp7_bl33: configs: Enable FIT as the boot.scr format

This patch switches on FIT verification of boot.scr. After this commit your
boot.scr must be in the FIT format.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
diff --git a/configs/warp7_bl33_defconfig b/configs/warp7_bl33_defconfig
index 2ec2249..29c4c24 100644
--- a/configs/warp7_bl33_defconfig
+++ b/configs/warp7_bl33_defconfig
@@ -57,3 +57,6 @@
 CONFIG_OPTEE=y
 CONFIG_OPTEE_TZDRAM_BASE=0x9e000000
 CONFIG_OPTEE_TZDRAM_SIZE=0x02000000
+CONFIG_FIT=y
+CONFIG_FIT_SIGNATURE=y
+CONFIG_FIT_VERBOSE=y