package/lvm2: enable device-mapper in Kernel config

LVM2 has a hard dependency on the device-mapper presence in the Kernel.
This commit enables those mandatory Kernel configuration by defining
the _LINUX_CONFIG_FIXUPS macro. This will make sure the final system
image will end up in a working configuration.

This was suggested by Arnout in [1].

[1] https://lists.buildroot.org/pipermail/buildroot/2024-April/688776.html

Suggested-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 419d39b2615973711404fc143e848755f6692cfc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/lvm2/lvm2.mk

@@ -76,5 +76,10 @@ HOST_LVM2_CONF_OPTS = \
 	--disable-selinux \
 	--with-confdir=$(HOST_DIR)/etc
 
+define LVM2_LINUX_CONFIG_FIXUPS
+	$(call KCONFIG_ENABLE_OPT,CONFIG_MD)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_DM)
+endef
+
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))