vc/intel/FSP2_0/CPX-SP: update to ww45 release and add watermark option

vc/intel/FSP2_0/CPX-SP: update to ww45 release and add watermark option

Intel CPX-SP FSP ww45 release annotates default values for FSP-M UPD
variables.

FSPM MemRefreshWatermark option support is present in FB's CPX-SP
FSP binary, but not in Intel's CPX-SP FSP binary. In FB's CPX-SP
FSP binary, this option takes the space of UnusedUpdSpace0[0].

For DeltaLake mainboard, if corresponding VPD variable is set, use it
to control the behavior. Such control is effective when FB's CPX-SP
FSP binary is used.

Signed-off-by: Jonathan Zhang <jonzhang@fb.com>
Change-Id: I57ad01f33b92bf61a6a2725dd1cdbbc99c02405d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46640
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
Reviewed-by: Christian Walter <christian.walter@9elements.com>