Update config.txt for new driver stack
Update config.txt for new driver stack

We have to disable overscan, mask gpu interrupts, and avoid warnings

KMS doesn't work right yet so overscan breaks all video

mask gpu interrupts is required by the new vc4 driver

avoid warnings prevents the firmware from doing spurious page flips to
display a low power warning icon.

amirna2/meta-raspberry,amirna2/meta-raspberry,kovrov/meta-raspberrypi,amirna2/meta-raspberry,kovrov/meta-raspberrypi,kovrov/meta-raspberrypi