soc/qualcomm/sc7280: Add support to configure 6bit color depth
Some of the eDp panels use 6bit color depth as default.
Set the default color depth configuration to 6 bit when there
is no match with the supported color depths.
BUG=b:
255870643
TEST=Validated on sc7280 Zombie development board
Change-Id: I2cea10ad417a05f020e4c418f15212fee06a2369
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72744
Reviewed-by: Shelley Chen <shchen@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>