package/systemd: enable required oomd kernel options

In order for systemd-oomd to run CONFIG_PSI and CONFIG_MEMCG must be
enabled in the kernel config.

See:
https://github.com/systemd/systemd/commit/e7b3f1a6c358dd3eaf0b50547bd52130ad4126ae
https://github.com/systemd/systemd/commit/aa329b89223a79793cde8288b1bc6e93db174938

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>

package/systemd/systemd.mk

@@ -480,6 +480,10 @@ endif
 ifeq ($(BR2_PACKAGE_SYSTEMD_OOMD),y)
 SYSTEMD_CONF_OPTS += -Doomd=true
 SYSTEMD_OOMD_USER = systemd-oom -1 systemd-oom -1 * - - - systemd Userspace OOM Killer
+define SYSTEMD_OOMD_LINUX_CONFIG_FIXUPS
+	$(call KCONFIG_ENABLE_OPT,CONFIG_PSI)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_MEMCG)
+endef
 else
 SYSTEMD_CONF_OPTS += -Doomd=false
 endif
@@ -804,6 +808,8 @@ define SYSTEMD_LINUX_CONFIG_FIXUPS
 	$(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_XATTR)
+
+	$(SYSTEMD_OOMD_LINUX_CONFIG_FIXUPS)
 endef
 
 # We need a very minimal host variant, so we disable as much as possible.