Use common patch format.

QUILT_DIFF_OPTS="--show-c-function"
QUILT_PATCH_OPTS="--unified"
QUILT_REFRESH_ARGS="--no-timestamps -p ab --no-index"
[logging] Wrap logs in general.
[surfman] Add simple surfman support.

Extend VBE interface in the emulation to match the expectation of the
vgabios shipped in hvmloader.
Add a DCL to communicate with Surfman.
Extract the VRAM MemoryRegion to support 0-copy (in this case graphics
in general) once the VRAM is put in the physmap where BAR0 is mapped.

/!\ WIP. No graphic output until 0:2.0 bar0 is mapped.