brcmfmac: de-init driver layers in correct order.

First clean up fw signalling, before cleaning up the bus and
proto layer. Old order can cause oops in some circumstances.
Reviewed-by: NArend Van Spriel <arend@broadcom.com>
Reviewed-by: NFranky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: NDaniel (Deognyoun) Kim <dekim@broadcom.com>
Signed-off-by: NHante Meuleman <meuleman@broadcom.com>
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c

@@ -1040,12 +1040,12 @@ void brcmf_detach(struct device *dev)
 
 	brcmf_cfg80211_detach(drvr->config);
 
+	brcmf_fws_deinit(drvr);
+
 	brcmf_bus_detach(drvr);
 
 	brcmf_proto_detach(drvr);
 
-	brcmf_fws_deinit(drvr);
-
 	brcmf_debugfs_detach(drvr);
 	bus_if->drvr = NULL;
 	kfree(drvr);