mainboard/google/kahlee: Reduce VRAM to 16MB
It was determined through testing that 16MB of reserved VRAM is
sufficient. Additional RAM for the graphics driver is allocated out
of system memory.
BUG=b:
123579702
TEST=Boot Grunt, watch VRAM usage with graphics driver logging.
Change-Id: I44b640f015b45c0dc3d701929549f3a1082a9268
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33368
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>