brcmfmac: fweh: Add missing description for 'gfp'

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:394: warning: Function parameter or member 'gfp' not described in 'brcmf_fweh_process_event'

Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
Cc: Franky Lin <franky.lin@broadcom.com>
Cc: Hante Meuleman <hante.meuleman@broadcom.com>
Cc: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
Cc: Wright Feng <wright.feng@cypress.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: brcm80211-dev-list.pdl@broadcom.com
Cc: brcm80211-dev-list@cypress.com
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201102112410.1049272-19-lee.jones@linaro.org

drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c

@@ -384,6 +384,7 @@ int brcmf_fweh_activate_events(struct brcmf_if *ifp)
  * @drvr: driver information object.
  * @event_packet: event packet to process.
  * @packet_len: length of the packet
+ * @gfp: memory allocation flags.
  *
  * If the packet buffer contains a firmware event message it will
  * dispatch the event to a registered handler (using worker).