mtd: mtdcore: constify name param in mtd_bdi_init

The bdi name is not modified by the function, it should be const.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210225143329.430012-1-tomas.winkler@intel.com

drivers/mtd/mtdcore.c

@@ -2173,7 +2173,7 @@ static int mtd_proc_show(struct seq_file *m, void *v)
 /*====================================================================*/
 /* Init code */
 
-static struct backing_dev_info * __init mtd_bdi_init(char *name)
+static struct backing_dev_info * __init mtd_bdi_init(const char *name)
 {
 	struct backing_dev_info *bdi;
 	int ret;