mtd: lpddr: Mark functions as static and remove unused function

This patch marks the functions do_write_buffer() and do_erase_oneblock()
as static because because they are not used outside this file. It also
removes the unused function word_program() in lpddr/lpddr_cmds.c.

Thus, it also removes the following warnings in lpddr/lpddr_cmds.c:
drivers/mtd/lpddr/lpddr_cmds.c:391:5: warning: no previous prototype for ‘do_write_buffer’ [-Wmissing-prototypes]
drivers/mtd/lpddr/lpddr_cmds.c:472:5: warning: no previous prototype for ‘do_erase_oneblock’ [-Wmissing-prototypes]
drivers/mtd/lpddr/lpddr_cmds.c:751:5: warning: no previous prototype for ‘word_program’ [-Wmissing-prototypes]

Signed-off-by: Rashika Kheria <[e-mail]>
Reviewed-by: Josh Triplett <[e-mail]>
Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/lpddr/lpddr_cmds.c

···
 	wake_up(&chip->wq);
 }
 
-int do_write_buffer(struct map_info *map, struct flchip *chip,
+static int do_write_buffer(struct map_info *map, struct flchip *chip,
 			unsigned long adr, const struct kvec **pvec,
 			unsigned long *pvec_seek, int len)
 {
···
 	return ret;
 }
 
-int do_erase_oneblock(struct mtd_info *mtd, loff_t adr)
+static int do_erase_oneblock(struct mtd_info *mtd, loff_t adr)
 {
 	struct map_info *map = mtd->priv;
 	struct lpddr_private *lpddr = map->fldrv_priv;
···
 static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
 	return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK);
-}
-
-int word_program(struct map_info *map, loff_t adr, uint32_t curval)
-{
-    int ret;
-	struct lpddr_private *lpddr = map->fldrv_priv;
-	int chipnum = adr >> lpddr->chipshift;
-	struct flchip *chip = &lpddr->chips[chipnum];
-
-	mutex_lock(&chip->mutex);
-	ret = get_chip(map, chip, FL_WRITING);
-	if (ret) {
-		mutex_unlock(&chip->mutex);
-		return ret;
-	}
-
-	send_pfow_command(map, LPDDR_WORD_PROGRAM, adr, 0x00, (map_word *)&curval);
-
-	ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->SingleWordProgTime));
-	if (ret)	{
-		printk(KERN_WARNING"%s word_program error at: %llx; val: %x\n",
-			map->name, adr, curval);
-		goto out;
-	}
-
-out:	put_chip(map, chip);
-	mutex_unlock(&chip->mutex);
-	return ret;
 }
 
 MODULE_LICENSE("GPL");