systemd: Bump version

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Reviewed-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Tested-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/systemd/systemd.hash

@@ -1,2 +1,2 @@
 # sha256 locally computed
-sha256 6766e8489e359f3d608a9f032eb1f52d7c55d76d0f9171837cf2b3284b2b904b  systemd-227.tar.gz
+sha256 dd124ff561a07e6439ed2b3713f38ca914df7747f110ce86deea17b56d245ae6  systemd-228.tar.gz

package/systemd/systemd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SYSTEMD_VERSION = 227
+SYSTEMD_VERSION = 228
 SYSTEMD_SITE = $(call github,systemd,systemd,v$(SYSTEMD_VERSION))
 SYSTEMD_LICENSE = LGPLv2.1+, GPLv2+ (udev), Public Domain (few source files, see README)
 SYSTEMD_LICENSE_FILES = LICENSE.GPL2 LICENSE.LGPL2.1 README