rtlwifi: rtl8723be: Fix sparse errors

Sparse reports the following:

drivers/net/wireless/rtlwifi/rtl8723be/sw.c:374:14: sparse: duplicate const

drivers/net/wireless/rtlwifi/rtl8723be/hw.c:2214:30: sparse: cast to restricted __le32

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>