config: Enable CBFS, ext4 for coreboot

Enable Coreboot and EXT4 Filesystems on the coreboot board.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/configs/coreboot.h

@@ -92,6 +92,9 @@
 #define CONFIG_MAC_PARTITION
 #define CONFIG_ISO_PARTITION		/* Experimental */
 
+#define CONFIG_CMD_CBFS
+#define CONFIG_CMD_EXT4
+#define CONFIG_CMD_EXT4_WRITE
 
 /*-----------------------------------------------------------------------
  * Video Configuration