package/udev: move back sgx group from systemd

Commit 6d163e12a4784580 (package/udev: move render and sgx to
package/systemd) moved the sgx group creation to the systemd package because
eudev at that time did not reference it.  This changed in eudev 3.1.12 with
commit a8ffcd1b985fb4 (rules/50-udev-default.rules: fix issue 160) so move
it back to get rid of a warning from udevd:

udevd[303]: specified group 'sgx' unknown

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/systemd/systemd.mk

@@ -639,7 +639,6 @@ endef
 define SYSTEMD_USERS
 	# udev user groups
 	- - render -1 * - - - DRI rendering nodes
-	- - sgx -1 * - - - SGX device nodes
 	# systemd user groups
 	- - systemd-journal -1 * - - - Journal
 	$(SYSTEMD_REMOTE_USER)

package/udev/udev.mk

@@ -8,6 +8,7 @@
 define UDEV_USERS
 	- - input -1 * - - - Input device group
 	- - kvm -1 * - - - kvm nodes
+	- - sgx -1 * - - - SGX device nodes
 endef
 
 $(eval $(virtual-package))