mb/google/brya/var/nissa: Select FSP_TYPE_IOT for non-ChromeOS builds

Select FSP_TYPE_IOT, so that Nissa-baseboard boards can be built using
FSP binaries from 3rdparty/fsp.

TEST=build/boot google/craask

Change-Id: I0ba45205e3af9daf7c41d393689d8f14d847a446
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86801
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>

src/mainboard/google/brya/Kconfig

@@ -90,6 +90,7 @@ config BOARD_GOOGLE_BASEBOARD_NISSA
 	select CHROMEOS_DRAM_PART_NUMBER_IN_CBI if CHROMEOS
 	select DRIVERS_AUDIO_SOF
 	select DRIVERS_INTEL_ISH
+	select FSP_TYPE_IOT if !CHROMEOS
 	select MAINBOARD_DISABLE_STAGE_CACHE
 	select MAINBOARD_HAS_EARLY_LIBGFXINIT
 	select MEMORY_SOLDERDOWN