staging: exfat: Remove unused struct 'dev_info_t'

Remove global declaration of unused struct "dev_info_t".
Structure "dev_info_t" is defined in exfat.h and not referenced in any
other file.
Signed-off-by: Pragat Pandya <pragat.pandya@gmail.com>
Link: https://lore.kernel.org/r/20200130101118.15936-3-pragat.pandya@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/exfat/exfat.h

@@ -231,11 +231,6 @@ struct date_time_t {
 	u16      MilliSecond;
 };
 
-struct dev_info_t {
-	u32      SecSize;    /* sector size in bytes */
-	u32      DevSize;    /* block device size in sectors */
-};
-
 struct vol_info_t {
 	u32      FatType;
 	u32      ClusterSize;