tools: Reorganize mkfwumdata tool into fwumdata_src directory

Update FWU metadata-related tools by moving mkfwumdata.c into a new
tools/fwumdata_src/ directory structure. This refactoring prepares for the
addition of the fwumdata runtime tool, which will allow editing FWU
metadata directly from the target.

The Kconfig and Makefile entries are also moved into separate files within
the new directory (Kconfig and fwumdata.mk respectively) to keep all FWU
metadata tool configurations together and improve maintainability.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Tested-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

MAINTAINERS

@@ -1246,9 +1246,10 @@ FWU Multi Bank Update
 M:	Sughosh Ganu <sughosh.ganu@arm.com>
 S:	Maintained
 T:	git https://source.denx.de/u-boot/custodians/u-boot-efi.git
+F:	doc/mkfwumdata.1
 F:	lib/fwu_updates/*
 F:	drivers/fwu-mdata/*
-F:	tools/mkfwumdata.c
+F:	tools/fwumdata_src/mkfwumdata.c
 
 GATEWORKS_SC
 M:	Tim Harvey <tharvey@gateworks.com>

tools/Kconfig

@@ -194,13 +194,6 @@ config LUT_SEQUENCE
 	help
 	  Look Up Table Sequence
 
-config TOOLS_MKFWUMDATA
-	bool "Build mkfwumdata command"
-	default y if FWU_MULTI_BANK_UPDATE
-	help
-	  This command allows users to create a raw image of the FWU
-	  metadata for initial installation of the FWU multi bank
-	  update on the board. The installation method depends on
-	  the platform.
+source tools/fwumdata_src/Kconfig
 
 endmenu

tools/Makefile

@@ -272,9 +272,7 @@ mkeficapsule-objs := generated/lib/uuid.o \
 	mkeficapsule.o
 hostprogs-always-$(CONFIG_TOOLS_MKEFICAPSULE) += mkeficapsule
 
-mkfwumdata-objs := mkfwumdata.o generated/lib/crc32.o
-HOSTLDLIBS_mkfwumdata += -luuid
-hostprogs-always-$(CONFIG_TOOLS_MKFWUMDATA) += mkfwumdata
+include tools/fwumdata_src/fwumdata.mk
 
 # We build some files with extra pedantic flags to try to minimize things
 # that won't build on some weird host compiler -- though there are lots of

tools/fwumdata_src/Kconfig

@@ -0,0 +1,8 @@
+config TOOLS_MKFWUMDATA
+	bool "Build mkfwumdata command"
+	default y if FWU_MULTI_BANK_UPDATE
+	help
+	  This command allows users to create a raw image of the FWU
+	  metadata for initial installation of the FWU multi bank
+	  update on the board. The installation method depends on
+	  the platform.

tools/fwumdata_src/fwumdata.mk

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2025, Kory Maincent <kory.maincent@bootlin.com>
+
+mkfwumdata-objs := fwumdata_src/mkfwumdata.o generated/lib/crc32.o
+HOSTLDLIBS_mkfwumdata += -luuid
+hostprogs-always-$(CONFIG_TOOLS_MKFWUMDATA) += mkfwumdata