fwu-mdata: Allow multiple metadata storage drivers to be enabled

Change the Kconfig from a "choice" to a conditional block, allowing
multiple FWU metadata storage drivers to be selected simultaneously
instead of being mutually exclusive.

This enables systems with FWU metadata on different storage types
(e.g., both GPT-partitioned block devices and MTD devices) to have
both drivers compiled in. The board can then select the appropriate
driver at runtime based on the devicetree description.

The change converts FWU_MDATA to a menuconfig and replaces the
"choice/endchoice" block with "if FWU_MDATA/endif", making
FWU_MDATA_GPT_BLK default to 'y' for backward compatibility.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Change-Id: I16d402afeb195c914a21243591e82115742ef5ca
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/u-boot/+/543886
ACI: CITOOLS <MDG-smet-aci-reviews@list.st.com>
Tested-by: Patrice CHOTARD <patrice.chotard@foss.st.com>
Domain-Review: Patrice CHOTARD <patrice.chotard@foss.st.com>
Reviewed-by: Patrice CHOTARD <patrice.chotard@foss.st.com>

Author: kmaincent

drivers/fwu-mdata/Kconfig

@@ -1,21 +1,19 @@
-config FWU_MDATA
+menuconfig FWU_MDATA
 	bool "Driver support for accessing FWU Metadata"
 	depends on DM
 	help
 	  Enable support for accessing FWU Metadata partitions. The
 	  FWU Metadata partitions reside on the same storage device
 	  which contains the other FWU updatable firmware images.
 
-choice
-	prompt "Storage Layout Scheme"
-	depends on FWU_MDATA
-	default FWU_MDATA_GPT_BLK
+if FWU_MDATA
 
 config FWU_MDATA_GPT_BLK
 	bool "FWU Metadata access for GPT partitioned Block devices"
 	select PARTITION_TYPE_GUID
 	select PARTITION_UUIDS
-	depends on FWU_MDATA && BLK && EFI_PARTITION
+	depends on BLK && EFI_PARTITION
+	default y
 	help
 	  Enable support for accessing FWU Metadata on GPT partitioned
 	  block devices.
@@ -28,4 +26,4 @@ config FWU_MDATA_MTD
 	  (or non-GPT partitioned, e.g. partition nodes in devicetree)
 	  MTD devices.
 
-endchoice
+endif