da850/omap-l138: Add support to read u-boot image from MMC/SD

DA850/OMAP-L138 does not support strict MMC/SD boot mode. SPL will
be in SPI flash and U-Boot image will be in MMC/SD card. SPL will
do the low level initialization and then loads the u-boot image
from MMC/SD card.

Define CONFIG_SPL_MMC_LOAD macro in the DA850/OMAP-L138
configuration file to enable this feature.

Tested-by: Christian Riesch <christian.riesch@omicron.at>
Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: Rajashekhara, Sudhakar <sudhakar.raj@ti.com>
Signed-off-by: Hadli, Manjunath <manjunath.hadli@ti.com>
diff --git a/include/mmc.h b/include/mmc.h
index 2305986..7546b4a 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -27,6 +27,7 @@
 #define _MMC_H_
 
 #include <linux/list.h>
+#include <linux/compiler.h>
 
 #define SD_VERSION_SD	0x20000
 #define SD_VERSION_2	(SD_VERSION_SD | 0x20)
@@ -273,6 +274,7 @@
 int board_mmc_getcd(struct mmc *mmc);
 int mmc_switch_part(int dev_num, unsigned int part_num);
 int mmc_getcd(struct mmc *mmc);
+void spl_mmc_load(void) __noreturn;
 
 #ifdef CONFIG_GENERIC_MMC
 #define mmc_host_is_spi(mmc)	((mmc)->host_caps & MMC_MODE_SPI)