buildroot

package/rpi-firmware: bump revision

Of utmost importance, this bump allows to overclock the RPi to even
higher frequencies: ARM > 1200MHz, core > 600MHz, RAM > 600MHz. :-)
To be used with caution, of course! :-)

Fixes and enhancements for:
  - clocks : allow higher overclocks
  - audio  : PCM channel expansion/conversion
  - video  : stutter on streams without b-frames, choice of scaling /kernel/
  - camera : padding-removal, new YUV and BGR modes
  - decoder: timestamps fixes, frames interval tracking
  - encoder: misc jpeg encoding fixes, save inline motion vectors
  - display: don't require EDID on HDMI

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>