Fix Nexus 5 (hammerhead) boot and solve framebuffer issue at startup.

This Merge request solves https://gitlab.com/postmarketOS/linux-postmarketos/issues/5#note_107549300

With these modifications:

*The nexus 5 boots 100% of the time (tested 15 times in a row)

*The splash screen appears every-time as well.

*Most probably FDE becomes possible, since we can display on framebuffer (not tested yet).

This may also improve boot for other devices.