common: spl: Add spl sata boot support

Add spl_sata to read a fat partition from a bootable SATA
drive.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
diff --git a/common/spl/spl.c b/common/spl/spl.c
index 0645cee..774fdad 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -210,6 +210,11 @@
 		spl_usb_load_image();
 		break;
 #endif
+#ifdef CONFIG_SPL_SATA_SUPPORT
+	case BOOT_DEVICE_SATA:
+		spl_sata_load_image();
+		break;
+#endif
 	default:
 		debug("SPL: Un-supported Boot Device\n");
 		hang();