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/bayleybay/Kconfig b/board/intel/bayleybay/Kconfig
index 597228f..a622499 100644
--- a/board/intel/bayleybay/Kconfig
+++ b/board/intel/bayleybay/Kconfig
@@ -20,6 +20,7 @@
 	select X86_RESET_VECTOR
 	select INTEL_BAYTRAIL
 	select BOARD_ROMSIZE_KB_8192
+	select SPI_FLASH_WINBOND
 
 config PCIE_ECAM_BASE
 	default 0xe0000000