stm32mp: stm32prog: Add support of FWU_MDATA partition type

Add support of "FWU_MDATA" partition type in flashlayout to select
the TF-A firmware update metadata partition type guid, associated to
U-Boot "system" partition type guid, FWU_MDATA_GUID introduced by
commit 2eaedc95164f ("FWU: Add FWU metadata structure and driver for
accessing metadata") and used in gpt_get_mdata_partitions() for
commit 554b38f7a532 ("FWU: Add FWU metadata access driver for GPT
partitioned block devices")

See also recommendation in FWU-PSA-A_DEN0118_1.0ALP3.pdf
  4.1.2 Metadata integration with GPT
  When embedded in a GPT, each metadata replica occupies a single
  partition with PartitionTypeGUID = metadata_uuid.
  UUID = 8a7a84a0-8387-40f6-ab41-a8b9a5a60d23

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/mach-stm32mp/cmd_stm32prog/stm32prog.h b/arch/arm/mach-stm32mp/cmd_stm32prog/stm32prog.h
index a196270..feba295 100644
--- a/arch/arm/mach-stm32mp/cmd_stm32prog/stm32prog.h
+++ b/arch/arm/mach-stm32mp/cmd_stm32prog/stm32prog.h
@@ -105,6 +105,7 @@
 enum stm32prog_part_type {
 	PART_BINARY,
 	PART_FIP,
+	PART_FWU_MDATA,
 	PART_ENV,
 	PART_SYSTEM,
 	PART_FILESYSTEM,