firmware: Update to recent commit
firmware: Update to recent commit

There hasn't been a tagged version of the firmware lately, but there have been
several bugfixes listed in the commit history and we're about to move to v4.14.y
as the default kernel so let's get up-to-date.

The actual commit used is the most recent change to the firmware files as of
2018-02-26, the most recent commits which only change the kernel image and other
files we don't use are ignored.

Signed-off-by: Paul Barker <ea07171fd37de70b22964565a4c2bfd2bb2b3061@toganlabs.com>

schnitzeltony/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,leon-anavi/meta-raspberrypi,kraj/meta-raspberrypi,agherzan/meta-raspberrypi,kraj/meta-raspberrypi,agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi,leon-anavi/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi,leon-anavi/meta-raspberrypi,kraj/meta-raspberrypi