Add new config FSP_TYPE_IOT to add the IoT FSP option so that
respective mainboard Kconfig can use IoT FSP if needed.
Signed-off-by: Lean Sheng Tan <sheng.tan@9elements.com>
Change-Id: I01d891348c039269138e64290ae3d6ec75d3c687
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66367
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>