wil6210: constify cfg80211_ops structures

cfg80211_ops structures are only passed as an argument to the function
wiphy_new. This argument is of type const, so cfg80211_ops strutures
having this property can be declared as const.
Done using Coccinelle

@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct cfg80211_ops i@p = {...};

@ok1@
identifier r1.i;
position p;
@@
wiphy_new(&i@p,...)

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct cfg80211_ops i;

File size before:
   text	   data	    bss	    dec	    hex	filename
  18133	   6632	      0	  24765	   60bd wireless/ath/wil6210/cfg80211.o

File size after:
   text	   data	    bss	    dec	    hex	filename
  18933	   5832	      0	  24765	   60bd wireless/ath/wil6210/cfg80211.o

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>