rsi: Correct RSI_NEEDED_HEADROOM in mac80211_attach.

Currently, RSI_NEEDED_HEADROOM is '80' for rsi driver, which is wrong.
As per rsi internal frame format, the RSI_NEEDED_HEADROOM shall be '84',
which is 64(dword_align) + 4(extended_desc) + 16(frame_desc).
Hence, corrected the needed headroom.

Signed-off-by: Amol Hanwate <[e-mail]>
Signed-off-by: Siva Rebbagondla <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>

drivers/net/wireless/rsi/rsi_mgmt.h

···
 #include "rsi_main.h"
 
 #define MAX_MGMT_PKT_SIZE               512
-#define RSI_NEEDED_HEADROOM             80
+#define RSI_NEEDED_HEADROOM             84
 #define RSI_RCV_BUFFER_LEN              2000
 
 #define RSI_11B_MODE                    0