Add a devicetree setting to configure the CdClock (Core Display Clock)
frequency through a FSP UPD. Because the value for this UPD's default
setting is non-zero and devicetree settings default to 0 if not set,
adapt the devicetree values so that the value for the UPD's default
setting is used when the devicetree setting is zero.
Also update the comment describing the FSP UPD in the header file
FspsUpd.h to match the correct CdClock definition.
BUG=b:206557434
BRANCH=dedede
TEST=Build fw and confirm FSP setting are set properly by log
Signed-off-by: Simon Yang <simon1.yang@intel.com>
Change-Id: I917c2f10b130b0cd54f60e2ba98eb971d5ec3c97
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60009
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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