staging: brcm80211: remove usage of ETHER_MAX_LEN definition

The linux include file if_ether.h already provides a definition
ETH_FRAME_LEN although this is excluding checksum. So code uses
ETH_FRAME_LEN+ETH_FCS_LEN now.
Reviewed-by: Brett Rudley <brudley@broadcom.com>
Reviewed-by: Henry Ptasinski <henryp@broadcom.com>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Dowan Kim <dowan@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/include/bcmcdc.h

@@ -24,7 +24,7 @@ typedef struct cdc_ioctl {
 } cdc_ioctl_t;
 
 /* Max valid buffer size that can be sent to the dongle */
-#define CDC_MAX_MSG_SIZE   ETHER_MAX_LEN
+#define CDC_MAX_MSG_SIZE	(ETH_FRAME_LEN+ETH_FCS_LEN)
 
 /* len field is divided into input and output buffer lengths */
 #define CDCL_IOC_OUTLEN_MASK   0x0000FFFF	/* maximum or expected