mac80211: brcm: fix warning on ARCH_BCM2835

Completely disable dump_survey code on ARCH_BCM2835 to fix defined but not
used warning.
https://github.com/openwrt/openwrt/commit/512b762ddbb602b744f0e7a443cf4ac7422155c1?w=1#commitcomment-137899352

Fixes: 512b762ddbb6 ("mac80211: brcm: disable dump_survey on Raspberry Pi")
Signed-off-by: Álvaro Fernández Rojas <[email protected]>

package/kernel/mac80211/patches/brcm/865-brcmfmac-disable-dump_survey-on-bcm2835.patch

@@ -9,7 +9,23 @@ Signed-off-by: Álvaro Fernández Rojas <[email protected]>
 
 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
-@@ -8361,8 +8361,10 @@ struct brcmf_cfg80211_info *brcmf_cfg802
+@@ -7987,6 +7987,7 @@ static s32 brcmf_translate_country_code(
+ 	return 0;
+ }
+ 
++#if !defined(CONFIG_ARCH_BCM2835)
+ static int
+ brcmf_parse_dump_obss(char *buf, struct brcmf_dump_survey *survey)
+ {
+@@ -8209,6 +8210,7 @@ exit:
+ 		brcmf_set_mpc(ifp, 1);
+ 	return err;
+ }
++#endif /* CONFIG_ARCH_BCM2835 */
+ 
+ static void brcmf_cfg80211_reg_notifier(struct wiphy *wiphy,
+ 					struct regulatory_request *req)
+@@ -8361,8 +8363,10 @@ struct brcmf_cfg80211_info *brcmf_cfg802
  	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_GTK))
  		ops->set_rekey_data = brcmf_cfg80211_set_rekey_data;
  #endif