staging: rtlwifi: base.c: Replace bit shifting with BIT macro

Challenge suggested by coccinelle.
Prefer using BIT and replace bit shifting with the BIT(x) macro
and remove cast.
Signed-off-by: Payal Kshirsagar <payal.s.kshirsagar.98@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/base.c

@@ -2446,7 +2446,7 @@ struct sk_buff *rtl_make_del_ba(struct ieee80211_hw *hw,
 						  IEEE80211_STYPE_ACTION);
 	action_frame->u.action.category = WLAN_CATEGORY_BACK;
 	action_frame->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
-	params = (u16)(1 << 11);	/* bit 11 initiator */
+	params = BIT(11);		/* bit 11 initiator */
 	params |= (u16)(tid << 12);	/* bit 15:12 TID number */
 
 	action_frame->u.action.u.delba.params = cpu_to_le16(params);