x86: minnowmax: Add support for Winbond flash

This allows the use of the Dediprog em100pro so I can test SPI flash on
this board in my lab.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/board/intel/minnowmax/Kconfig b/board/intel/minnowmax/Kconfig
index 543468c..82a6ca9 100644
--- a/board/intel/minnowmax/Kconfig
+++ b/board/intel/minnowmax/Kconfig
@@ -21,6 +21,9 @@
 	select INTEL_BAYTRAIL
 	select BOARD_ROMSIZE_KB_8192
 	select SPI_FLASH_STMICRO
+	# Enable Winbond so we can use Dediprog em100pro emulator which does
+	# not support N25Q064
+	select SPI_FLASH_WINBOND
 
 config PCIE_ECAM_BASE
 	default 0xe0000000