wifi: brcmfmac: add missing header include for brcmf_dbg

Including the fwil.h header file can lead to a build error:

drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil.h: \
	In function ‘brcmf_fil_cmd_int_set’:
drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil.h:90:9: error: implicit \
	declaration of function ‘brcmf_dbg’ [-Werror=implicit-function-declaration]
   90 |         brcmf_dbg(FIL, "ifidx=%d, cmd=%d, value=%d\n", ifp->ifidx, cmd, data);
      |         ^~~~~~~~~

The error is often avoided because the debug.h header file is included
before the fwil.h header file.

This makes sure the header include order is irrelevant by explicitly adding the
debug.h header.

Fixes: 3134323 ("wifi: brcmfmac: export firmware interface functions")
Signed-off-by: Marcel Hamer <[email protected]>
Acked-by: Arend van Spriel <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: marcel-hamer

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

@@ -6,6 +6,8 @@
 #ifndef _fwil_h_
 #define _fwil_h_
 
+#include "debug.h"
+
 /*******************************************************************************
  * Dongle command codes that are interpreted by firmware
  ******************************************************************************/