feat(fwu): add a config flag for including image info in the FWU metadata

The version 2 of the FWU metadata structure is designed such that the
information on the updatable images can be omitted from the metadata
structure. Add a configuration flag, PSA_FWU_METADATA_FW_STORE_DESC,
which is used to select whether the metadata structure has this
information included or not. It's value is set to 1 by default.

Change-Id: I4463a20c94d2c745ddb0b2cc8932c12d418fbd42
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>

Makefile

@@ -1185,6 +1185,7 @@ $(eval $(call assert_booleans,\
 	COT_DESC_IN_DTB \
 	USE_SP804_TIMER \
 	PSA_FWU_SUPPORT \
+	PSA_FWU_METADATA_FW_STORE_DESC \
 	ENABLE_MPMM \
 	ENABLE_MPMM_FCONF \
 	FEATURE_DETECTION \
@@ -1360,6 +1361,7 @@ $(eval $(call add_defines,\
 	NR_OF_FW_BANKS \
 	NR_OF_IMAGES_IN_FW_BANK \
 	PSA_FWU_SUPPORT \
+	PSA_FWU_METADATA_FW_STORE_DESC \
 	ENABLE_BRBE_FOR_NS \
 	ENABLE_TRBE_FOR_NS \
 	ENABLE_SYS_REG_TRACE_FOR_NS \

make_helpers/defaults.mk

@@ -351,6 +351,14 @@ NR_OF_IMAGES_IN_FW_BANK		:= 1
 # Disable Firmware update support by default
 PSA_FWU_SUPPORT			:= 0
 
+# Enable image description in FWU metadata by default when PSA_FWU_SUPPORT
+# is enabled.
+ifeq ($(PSA_FWU_SUPPORT),1)
+PSA_FWU_METADATA_FW_STORE_DESC	:= 1
+else
+PSA_FWU_METADATA_FW_STORE_DESC	:= 0
+endif
+
 # Dynamic Root of Trust for Measurement support
 DRTM_SUPPORT			:= 0