feat(fwu): document the 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 config 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: Id6c99455db768edd59b0a316051432a900d30076
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
1 file changed