SPL: add support to boot from a partition type

the socfpga bootrom supports mmc booting from either a raw image
starting at 0x0, or from a partition of type 0xa2.  This patch
adds support for locating the boot image in the first type 0xa2
partition found.

Assigned a partition number of -1 will cause a search for a
partition of type CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
and use it to find the u-boot image

Signed-off-by: Dalon Westergreen <dwesterg@gmail.com>
diff --git a/disk/part_dos.c b/disk/part_dos.c
index c77d881..7ede15e 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -217,6 +217,7 @@
 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 #endif
+			info->sys_ind = pt->sys_ind;
 			return 0;
 		}