weston-init: set udev rule to display group for gst-record feature.

weston-init: set udev rule to display group for gst-record feature.

Bug-AGL: SPEC-559

some /dev module should be grant to access as display user.
When weston use gst-record, it accesses some /dev driver
as display user.

Change-Id: Ifc3ab94282d2857d48cfd5673c3eab944badddf3
Signed-off-by: Harunobu Kurokawa <harunobu.kurokawa.dn@renesas.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/9893
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>