brcmfmac: include required headers in cfg80211.h

Without this including cfg80211.h in a wrong order could result in:

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h:122:24: error: array type has incomplete element type
  struct brcmf_wsec_key key[BRCMF_MAX_DEFAULT_KEYS];
                        ^
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h:291:24: error: field ‘p2p’ has incomplete type
  struct brcmf_p2p_info p2p;
                        ^
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h:297:27: error: field ‘pmk_list’ has incomplete type
  struct brcmf_pmk_list_le pmk_list;
                           ^
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h:317:28: error: field ‘assoclist’ has incomplete type
  struct brcmf_assoclist_le assoclist;

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h

@@ -20,6 +20,9 @@
 /* for brcmu_d11inf */
 #include <brcmu_d11.h>
 
+#include "fwil_types.h"
+#include "p2p.h"
+
 #define WL_NUM_SCAN_MAX			10
 #define WL_TLV_INFO_MAX			1024
 #define WL_BSS_INFO_MAX			2048