add the dptc interface support when system in tablet mode.
In some FP5/FT5 platform, which will have different power or thermal
parameters depends on different form factor.
BUG=b:157943445
BRANCH=Zork
TEST=Build. check the setting changed.
Signed-off-by: Chris Wang <chris.wang@amd.corp-partner.google.com>
Change-Id: I2be7942132cea474237f531021ad4fd9856b5050
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44265
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
e019bd910f