soc/intel/common: Provide common block fast_spi_flash_ctrlr

Now that we have a common block driver for fast spi flash controller,
provide spi_ctrlr structure that can be used by different platforms
for defining the bus-ctrlr mapping. Only cs 0 is considered valid.

Change-Id: I7228ae885018d1e23e6e80dd8ce227b0d99d84a6
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/19575
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
4 files changed