ssb: fix per path sprom vars

On sprom version 4 and 5 there are 4 values for pa_2g, pa_5gl, pa_5g
and pa_5gh, for sprom version 8 and 9 there are only 3. Make the per
path sprom store also work for older sprom versions.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/ssb/ssb.h

@@ -19,7 +19,7 @@ struct ssb_driver;
 struct ssb_sprom_core_pwr_info {
 	u8 itssi_2g, itssi_5g;
 	u8 maxpwr_2g, maxpwr_5gl, maxpwr_5g, maxpwr_5gh;
-	u16 pa_2g[3], pa_5gl[3], pa_5g[3], pa_5gh[3];
+	u16 pa_2g[4], pa_5gl[4], pa_5g[4], pa_5gh[4];
 };
 
 struct ssb_sprom {