soc/intel/common/block: Move gspi common functions into block/gspi

This patch cleans soc/intel/{apollolake/cannonlake/skylake} by moving
common soc code into common/block/gspi.

BUG=b:78109109
BRANCH=none
TEST=Build and boot KBL/CNL/APL platform.

Change-Id: I877c7c48af928ca1e0399ec794d9400bc52edfcb
Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com>
Signed-off-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/26048
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
9 files changed