mtd: replace VMLINUX_SYMBOL_STR() with string literal

With the special case handling for Blackfin and Metag was removed by
commit 94e58e0a ("export.h: remove code for prefixing symbols with
underscore"), VMLINUX_SYMBOL_STR() can be replaced with string literal.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>

drivers/mtd/chips/gen_probe.c

@@ -202,10 +202,10 @@ static inline struct mtd_info *cfi_cmdset_unknown(struct map_info *map,
 	struct cfi_private *cfi = map->fldrv_priv;
 	__u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID;
 #ifdef CONFIG_MODULES
-	char probename[sizeof(VMLINUX_SYMBOL_STR(cfi_cmdset_%4.4X))];
+	char probename[sizeof("cfi_cmdset_%4.4X")];
 	cfi_cmdset_fn_t *probe_function;
 
-	sprintf(probename, VMLINUX_SYMBOL_STR(cfi_cmdset_%4.4X), type);
+	sprintf(probename, "cfi_cmdset_%4.4X", type);
 
 	probe_function = __symbol_get(probename);
 	if (!probe_function) {