mtd: Replace MTDIOC_PARTINFO with BIOC_PARTINFO

to simplify flt and partion layer implementation

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

drivers/mtd/ftl.c

@@ -540,12 +540,6 @@ static int ftl_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
 
       cmd = MTDIOC_FLUSH;
     }
-  else if (cmd == BIOC_PARTINFO)
-    {
-      /* Change the BIOC_PARTINFO command to the MTDIOC_PARTINFO command. */
-
-      cmd = MTDIOC_PARTINFO;
-    }
 
   /* No other block driver ioctl commands are not recognized by this
    * driver.  Other possible MTD driver ioctl commands are passed through

drivers/mtd/mtd_partition.c

@@ -414,7 +414,7 @@ static int part_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
         }
         break;
 
-      case MTDIOC_PARTINFO:
+      case BIOC_PARTINFO:
         {
           FAR struct partition_info_s *info =
             (FAR struct partition_info_s *)arg;