x86: kconfig: Let board select SPI flash

Only a specific type of SPI flash exists on a board, having board
Kconfig to select the SPI flash seems to make more sense. Other
flash types are not necessary except coreboot, which implies all
available flash drivers there.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/intel/crownbay/Kconfig b/board/intel/crownbay/Kconfig
index 05626a9..1eed227 100644
--- a/board/intel/crownbay/Kconfig
+++ b/board/intel/crownbay/Kconfig
@@ -21,5 +21,6 @@
 	select INTEL_QUEENSBAY
 	select BOARD_ROMSIZE_KB_1024
 	select BOARD_EARLY_INIT_F
+	select SPI_FLASH_SST
 
 endif