soc/intel/cannonlake: fix use of legacy 8254 timer

FSP sets the use of the 8254 timer via the Enable8254ClockGating
UPD, which defaults to enabled, overriding what is set by coreboot.
Per the FSP integration guide, this UPD needs to be disabled when
a legacy OS is booted (ie, when SeaBIOS is used as the payload).

Add a Kconfig option to set the UPD properly based on payload
selection, and remove the existing coreboot code in lpc.c since
it is either ineffective or being overridden by FSP.

Test: build/boot out-of-tree WHL board with both SeaBIOS and
Tianocore, ensure 8254 timer usage set correctly for each.

Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Change-Id: I0e888bf754cb72093f14fc02f39bddcd6d288203
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33512
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

0 files changed, 0 insertions, 0 deletions