Modify the vbios's eDP signal setting from level0(0dB)
to level1 (3.5dB) for bard
Add VBT blobs and include it in cbfs
BUG=b:119448457
TEST=Test & measure eDP signal
Change-Id: I0b854a6adad43844282aed61d26e798727b5cb62
Signed-off-by: Ren Kuo <ren.kuo@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/30375
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>