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/cougarcanyon2/Kconfig b/board/intel/cougarcanyon2/Kconfig
index 4e7d021..ed76448 100644
--- a/board/intel/cougarcanyon2/Kconfig
+++ b/board/intel/cougarcanyon2/Kconfig
@@ -22,5 +22,6 @@
 	select HAVE_FSP
 	select BOARD_ROMSIZE_KB_2048
 	select BOARD_EARLY_INIT_F
+	select SPI_FLASH_WINBOND
 
 endif