meta-raspberrypi: update to HEAD on rocko

9e08912 linux-raspberrypi: update 4.9 recipe to current HEAD
4bbb925 Revert "weston: remove rpi-backend configuration switch"
7e53b1c layer-contents.md: Update documentation
79bf721 rpi-base.inc: Add Raspberry Pi 3B+ dtb
cc32907 firmware: Update to 20180313
0bb2038 linux-raspberrypi: Update 4.9 recipe to current HEAD
d594ecb rpi-base.inc: set default wic kickstart file
bc85503 linux-firmware: fix addition of NVRAM file to image (fixes #184)
a2d98d9 linux-firmware: make rpi fw specific to rpi
2be59f2 linux-firmware: Replace /lib with ${nonarch_base_libdir}
b23820b firmware: Use snapshots from master again
aee32ad firmware: Update to recent commit
6de99b9 linux-raspberrypi: Update to v4.9.80
edd2998 rpi-config: fix config variables with the same initial name being overwritten
6fb15a9 linux-raspberrypi: Update 4.9 recipe to 4.9.77
0ef0abc docs: Do not force alabaster theme
a8108a6 readme: Update quick links
0e5a19d linux-raspberrypi: Update to 4.9.65
20358ec sdimage-raspberrypi.wks: find /boot partition on mmcblk0

The most significant changes from above are:

  9e08912 linux-raspberrypi: update 4.9 recipe to current HEAD
  4bbb925 Revert "weston: remove rpi-backend configuration switch"

Which resolve problem with GPU running OOM and fixes kernel warning
related to vc4graphics runtime suspend.

Signed-off-by: Mirza Krak <mirza.krak@northern.tech>

Author: mirzak