wifi: mwifiex: Constify struct mwifiex_if_ops

wifi: mwifiex: Constify struct mwifiex_if_ops

'struct mwifiex_if_ops' are not modified in these drivers.

Constifying these structures moves some data to a read-only section, so
increase overall security, especially when the structure holds some
function pointers.

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  61439	   4367	     32	  65838	  1012e	drivers/net/wireless/marvell/mwifiex/pcie.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  61699	   4127	     32	  65858	  10142	drivers/net/wireless/marvell/mwifiex/pcie.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/03d524b72f20a0302e4de5e0ebdc20ab69469dec.1737308889.git.christophe.jaillet@wanadoo.fr