package/swupdate: enable/disable systemd support automatically

This needs to be set properly so that services work correctly.

Enable disable automatically based on BR2_PACKAGE_SYSTEMD state.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 85062dcefc352f96b309cb232bc931374e8ca077)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/swupdate/swupdate.mk

@@ -139,6 +139,13 @@ endif
 
 ifeq ($(BR2_PACKAGE_SYSTEMD),y)
 SWUPDATE_DEPENDENCIES += systemd
+define SWUPDATE_SET_SYSTEMD
+	$(call KCONFIG_ENABLE_OPT,CONFIG_SYSTEMD)
+endef
+else
+define SWUPDATE_SET_SYSTEMD
+	$(call KCONFIG_DISABLE_OPT,CONFIG_SYSTEMD)
+endef
 endif
 
 ifeq ($(BR2_PACKAGE_LIBUBOOTENV),y)
@@ -192,6 +199,7 @@ SWUPDATE_MAKE_OPTS = \
 
 define SWUPDATE_KCONFIG_FIXUP_CMDS
 	$(SWUPDATE_SET_LUA_VERSION)
+	$(SWUPDATE_SET_SYSTEMD)
 endef
 
 define SWUPDATE_BUILD_CMDS