intel/skylake: Create "RtcLock" Silicon UPD from coreboot

FSP should not lock CMOS unconditionally. coreboot sends Silicon
UPD parameter "RtcLock" to FSP to take action on CMOS
region locking/un-locking. This patch has CB generic code for
creating the Silicon UPD paramater.

BUG=chrome-os-partner:44484
BRANCH=none
TEST=Build and booted in kunimitsu, tested using below command-
When DIsabled RtcLock from devicetree in coreboot, booted to kernel
and run following commands -
>> crossystem fw_result=success
>> crossystem | grep fw_result
It should reflect the value that is set. Here, success.
If ENabled RtcLock from Coreboot devicetree, The same commands will
fail to update the fw_result status from crossystem utility.
CQ-DEPEND=CL:*229144

Change-Id: I7f63332097cdaf6eedefbc84bec69ce4e9cc59d7
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c7b8293a2c55117d7ca2001ac9ec0de24d35b80b
Original-Change-Id: If708e2c782644dcf7f03785d1bfa235ef5385d80
Original-Signed-off-by: Barnali Sarkar <barnali.sarkar@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/297980
Original-Commit-Ready: Subrata Banik <subrata.banik@intel.com>
Original-Tested-by: Subrata Banik <subrata.banik@intel.com>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11655
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

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