ARM: config: Enable config to decompress the FIT image

Enable FIT and SHA config to decompress the kernel image

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
diff --git a/configs/poleg_evb_defconfig b/configs/poleg_evb_defconfig
index b00fb48..cab589d 100644
--- a/configs/poleg_evb_defconfig
+++ b/configs/poleg_evb_defconfig
@@ -102,3 +102,6 @@
 CONFIG_WDT_NPCM=y
 CONFIG_LIB_HW_RAND=y
 CONFIG_SHA_HW_ACCEL=y
+CONFIG_FIT=y
+CONFIG_SHA256=y
+CONFIG_SHA512=y