M28: Add MMC SPL

This patch adds SPL code for the M28 board.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Andy Fleming <afleming@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
diff --git a/include/configs/m28evk.h b/include/configs/m28evk.h
index d88e09e..59e3e05 100644
--- a/include/configs/m28evk.h
+++ b/include/configs/m28evk.h
@@ -43,6 +43,14 @@
 #define	CONFIG_ARCH_CPU_INIT
 
 /*
+ * SPL
+ */
+#define	CONFIG_SPL
+#define	CONFIG_SPL_NO_CPU_SUPPORT_CODE
+#define	CONFIG_SPL_START_S_PATH		"board/denx/m28evk"
+#define	CONFIG_SPL_LDSCRIPT		"board/denx/m28evk/u-boot-spl.lds"
+
+/*
  * U-Boot Commands
  */
 #include <config_cmd_default.h>