firehose: change error message to info for multiple boot partition

On some platforms, we support Boot LUN redundancy, with the boot
partitions duplicated on more than 1 LUN. Only 1 LUN can be boot
active at any time, but the platform can switch on reboot in case of
corruption. As such, when flashing a full system, we end up flashing
boot partition on several LUN, and the "first" LUN with SBL or XBL
will be used as the initial/primary boot device for the
setbootablestoragedrive command.

Up until this commit we displayed an error message in this situation,
but let's turn that into an ux_info() log instead, since it's not an
error.

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@oss.qualcomm.com>

Author: ndechesne

firehose.c

@@ -804,7 +804,7 @@ int firehose_run(struct qdl_device *qdl, const char *incdir, const char *storage
 		ux_debug("no boot partition found\n");
 	} else {
 		if (multiple) {
-			ux_err("WARNING: Multiple candidates for primary bootloader found, using partition %d\n",
+			ux_info("Multiple candidates for primary bootloader found, using partition %d\n",
 				bootable);
 		}
 		firehose_set_bootable(qdl, bootable);