x86: Move CONFIG_ENV_IS_IN_SPI_FLASH to x86-common.h

Since all x86 boards use spi flash as its bootloader storage media,
it makes sense to make CONFIG_ENV_IS_IN_SPI_FLASH a common option.
So far only minnowmax board does not support it so undefine it in
its board configuration file.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

include/configs/chromebook_link.h

@@ -16,4 +16,7 @@
 #include <configs/x86-common.h>
 #include <configs/x86-chromebook.h>
 
+#define CONFIG_ENV_SECT_SIZE		0x1000
+#define CONFIG_ENV_OFFSET		0x003f8000
+
 #endif	/* __CONFIG_H */

include/configs/crownbay.h

@@ -61,10 +61,6 @@
 #undef CONFIG_CFB_CONSOLE
 
 /* Environment configuration */
-#undef CONFIG_ENV_IS_NOWHERE
-#undef CONFIG_ENV_SIZE
-#define CONFIG_ENV_IS_IN_SPI_FLASH
-#define CONFIG_ENV_SIZE			0x1000
 #define CONFIG_ENV_SECT_SIZE		0x1000
 #define CONFIG_ENV_OFFSET		0
 

include/configs/galileo.h

@@ -63,10 +63,6 @@
 #define CONFIG_PHYLIB
 
 /* Environment configuration */
-#undef CONFIG_ENV_IS_NOWHERE
-#undef CONFIG_ENV_SIZE
-#define CONFIG_ENV_IS_IN_SPI_FLASH
-#define CONFIG_ENV_SIZE			0x1000
 #define CONFIG_ENV_SECT_SIZE		0x1000
 #define CONFIG_ENV_OFFSET		0
 

include/configs/minnowmax.h

@@ -69,4 +69,8 @@
 /* Avoid a warning in the Realtek Ethernet driver */
 #define CONFIG_SYS_CACHELINE_SIZE 16
 
+/* Environment in SPI flash is unsupported for now */
+#undef CONFIG_ENV_IS_IN_SPI_FLASH
+#define CONFIG_ENV_IS_NOWHERE
+
 #endif	/* __CONFIG_H */

include/configs/x86-common.h

@@ -207,7 +207,7 @@
 /*-----------------------------------------------------------------------
  * Environment configuration
  */
-#define CONFIG_ENV_IS_NOWHERE
+#define CONFIG_ENV_IS_IN_SPI_FLASH
 #define CONFIG_ENV_SIZE			0x01000
 
 /*-----------------------------------------------------------------------