mtd: add missing MODULE_DESCRIPTION() macros

With ARCH=x86, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mtd/parsers/brcm_u-boot.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mtd/parsers/tplink_safeloader.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mtd/chips/cfi_util.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mtd/chips/cfi_cmdset_0020.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mtd/maps/map_funcs.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240610-md-drivers-mtd-v1-1-0f59183e4005@quicinc.com

drivers/mtd/chips/cfi_cmdset_0020.c

@@ -1399,4 +1399,5 @@ static void cfi_staa_destroy(struct mtd_info *mtd)
 	kfree(cfi);
 }
 
+MODULE_DESCRIPTION("MTD chip driver for ST Advanced Architecture Command Set (ID 0x0020)");
 MODULE_LICENSE("GPL");

drivers/mtd/chips/cfi_util.c

@@ -441,4 +441,5 @@ int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
 
 EXPORT_SYMBOL(cfi_varsize_frob);
 
+MODULE_DESCRIPTION("Common Flash Interface Generic utility functions");
 MODULE_LICENSE("GPL");

drivers/mtd/maps/map_funcs.c

@@ -41,4 +41,5 @@ void simple_map_init(struct map_info *map)
 }
 
 EXPORT_SYMBOL(simple_map_init);
+MODULE_DESCRIPTION("Out-of-line map I/O");
 MODULE_LICENSE("GPL");

drivers/mtd/parsers/brcm_u-boot.c

@@ -81,4 +81,5 @@ static struct mtd_part_parser brcm_u_boot_mtd_parser = {
 };
 module_mtd_part_parser(brcm_u_boot_mtd_parser);
 
+MODULE_DESCRIPTION("Broadcom's U-Boot partition parser");
 MODULE_LICENSE("GPL");

drivers/mtd/parsers/tplink_safeloader.c

@@ -149,4 +149,5 @@ static struct mtd_part_parser mtd_parser_tplink_safeloader = {
 };
 module_mtd_part_parser(mtd_parser_tplink_safeloader);
 
+MODULE_DESCRIPTION("TP-Link Safeloader partitions parser");
 MODULE_LICENSE("GPL");