systemd: do not add systemd-journal-gateway user/group
projects/*/linux/linux.*.conf: unset CONFIG_FW_LOADER_USER_HELPER
linux: RPi: unset CONFIG_UEVENT_HELPER_PATH
linux 3.12.1: add Haswell HDMI buffer alignment to fix 5.1 pcm
Merge pull request #2784 from laurimyllari/master-intel-fixes

linux 3.12.1: add Haswell HDMI buffer alignment to fix 5.1 pcm