cmd: fwu: Dump custom fields from mdata structure

The commit cb9ae40a16f0 ("tools: mkfwumdata: add logic to append vendor
data to the FWU metadata") added support for adding vendor data to mdata
structure but it is not visible anywhere that's why extend fwu command to
dump it.

Tested-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index ecef664..c2ce519 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -185,6 +185,7 @@
 config CMD_FWU_METADATA
 	bool "fwu metadata read"
 	depends on FWU_MULTI_BANK_UPDATE
+	imply HEXDUMP if FWU_MDATA_V2
 	help
 	  Command to read the metadata and dump it's contents