staging: vt665x: fix alignment constraints

multiple structures contains a ieee80211_rts structure, which is required to
have at least two byte alignment, but are annotated with a __packed attribute
to force single-byte alignment:

staging/vt6656/rxtx.h:98:1: warning: alignment 1 of 'struct vnt_rts_g' is less than 2 [-Wpacked-not-aligned]
staging/vt6656/rxtx.h:106:1: warning: alignment 1 of 'struct vnt_rts_ab' is less than 2 [-Wpacked-not-aligned]
staging/vt6656/rxtx.h:116:1: warning: alignment 1 of 'struct vnt_cts' is less than 2 [-Wpacked-not-aligned]

I see no reason why the structure itself would be misaligned, and all members
have at least two-byte alignment within the structure, so use the same
constraint on the sturcture itself.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210204162731.3132069-1-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/rxtx.h

@@ -111,7 +111,7 @@ struct vnt_rts_g {
 	__le16 duration_bb;
 	u16 reserved;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_g_fb {
 	struct vnt_phy_field b;
@@ -125,14 +125,14 @@ struct vnt_rts_g_fb {
 	__le16 rts_duration_ba_f1;
 	__le16 rts_duration_aa_f1;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_ab {
 	struct vnt_phy_field ab;
 	__le16 duration;
 	u16 reserved;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_a_fb {
 	struct vnt_phy_field a;
@@ -141,7 +141,7 @@ struct vnt_rts_a_fb {
 	__le16 rts_duration_f0;
 	__le16 rts_duration_f1;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 /* CTS buffer header */
 struct vnt_cts {

drivers/staging/vt6656/rxtx.h

@@ -95,15 +95,15 @@ struct vnt_rts_g {
 	u16 wReserved;
 	struct ieee80211_rts data;
 	struct vnt_tx_datahead_g data_head;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_ab {
 	struct vnt_phy_field ab;
 	__le16 duration;
 	u16 wReserved;
 	struct ieee80211_rts data;
 	struct vnt_tx_datahead_ab data_head;
-} __packed;
+} __packed __aligned(2);
 
 /* CTS buffer header */
 struct vnt_cts {
@@ -113,7 +113,7 @@ struct vnt_cts {
 	struct ieee80211_cts data;
 	u16 reserved2;
 	struct vnt_tx_datahead_g data_head;
-} __packed;
+} __packed __aligned(2);
 
 union vnt_tx_data_head {
 	/* rts g */