intel/fsp: Update Cannonlake FSP header

Update Cannonlake FSP header to version 7.x.2A.20, the following changes
were made:
    1. Add MemtestonWarmBoot option.
    2. Add enable8254clockgatingonS3 option.
    3. Default disable Tccoffsetlock

BUG=None
TEST=None

Change-Id: Ie794960f0253b2a6dbd55ffda973756d15e35c01
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/25289
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Caveh Jalali <caveh@google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
2 files changed