mb/google/nissa/var/craask: Change craask to use 16M SPI flash

BUG=b:236175568
TEST=Build and test on MB, system can boot to OS.

Signed-off-by: Tyler Wang <tyler.wang@quanta.corp-partner.google.com>
Change-Id: I779355dcc69eed08703bcb8bb943dcfeeb1fdea1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65945
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

src/mainboard/google/brya/Kconfig.name

@@ -219,7 +219,6 @@ config BOARD_GOOGLE_KINOX
 config BOARD_GOOGLE_CRAASK
 	bool "->  Craask"
 	select BOARD_GOOGLE_BASEBOARD_NISSA
-	select BOARD_ROMSIZE_KB_32768
 	select DRIVERS_GENERIC_GPIO_KEYS
 	select DRIVERS_GENESYSLOGIC_GL9750
 	select DRIVERS_INTEL_MIPI_CAMERA