soc/intel/common/block/gspi: Add SOC_INTEL_COMMON_BLOCK_GSPI_VERSION_2

Even though kaby lake and cannon lake are using the same GSPI
controller, bit meanings (for polarity and state) in SPI_CS_CONTROL
register are significantly different. This change provides a new
Kconfig option that can be selected by SoCs using these new bit
definitions of SPI_CS_CONTROL. Common code takes care of setting the
right value for polarity and state field depending upon the version
selected by SoC.

BUG=b:70628116

Change-Id: Ic69321483a58bb29f939b0d8b37f33ca30eb53b8
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/22954
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Shelley Chen <shchen@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2 files changed