FASTBOOT: Fix sparse: out-length format

The printf that outputs the length of a sparse file had a "0x" in
front of a non-hex format (%llu).  I removed the 0x and changed
the format to work better with the way the fastboot program
prints out the messages.

Before:
    (bootloader)
    sparse: out-length-0x8415 MB
After:
    (bootloader) sparse: out-length 8415 MB

Change-Id: I5307c437dd02a5075f06ef728e1e0f58a34c4c94
Signed-off-by: Scott Anderson <[email protected]>
diff --git a/common/cmd_fastboot.c b/common/cmd_fastboot.c
index b37bf82..85b3b1d 100644
--- a/common/cmd_fastboot.c
+++ b/common/cmd_fastboot.c
@@ -963,7 +963,7 @@
 		}
 	}
 
-	printf("\nsparse: out-length-0x%llu MB\n", outlen/(1024*1024));
+	printf("sparse: out-length %llu MB\n", outlen/(1024*1024));
 	return 0;
 }