staging: brcm80211: remove volatile keyword used in struct rte_console

Two members vcons_in and vcons_out were declared using the volatile
keyword. However, there is no reason for doing so. The member is
used only to calculate the backplane address to access using offsetof.
This address is passed to subsequent read function. Use of volatile
is not warranted.
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Reviewed-by: NRoland Vossen <rvossen@broadcom.com>
Reviewed-by: NFranky Lin <frankyl@broadcom.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmfmac/dhd_sdio.c

@@ -126,8 +126,8 @@ struct rte_console {
 	 * (at risk of conflicting with
 	 * the real UART).  vcons_out is currently unused.
 	 */
-	volatile uint vcons_in;
-	volatile uint vcons_out;
+	uint vcons_in;
+	uint vcons_out;
 
 	/* Output (logging) buffer
 	 * Console output is written to a ring buffer log_buf at index log_idx.