flash_ec: add array for boards which use NPCX internal SPI
flash_ec: add array for boards which use NPCX internal SPI

Created array for the NPCX internal SPI for the boards which
do not use standard overlays.

BUG=none
BRANCH=none
TEST=Able to flash npcx9m3f using MECC AIC on ADLRVP

Signed-off-by: Vijay Hiremath <006c712879a3af08bfdb5c2b8491a8b2d5fd73cd@intel.com>
Change-Id: I57e4909f0b487b0efa4a3fa26f8b3d5465267dd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3101842
Reviewed-by: Tanu Malhotra <88bcd522e76d112209f1cebbc3fc47e8f6ff3003@intel.com>
Reviewed-by: caveh jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec