brcmfmac: p2p: Fix a couple of function headers

Most likely caused by doc-rot.

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

 drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c:977: warning: Function parameter or member 'wdev' not described in 'brcmf_p2p_remain_on_channel'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c:2048: warning: Function parameter or member 'cfg' not described in 'brcmf_p2p_ifchange'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c:2048: warning: Excess function parameter 'mac' description in 'brcmf_p2p_ifchange'

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/20200826093401.1458456-7-lee.jones@linaro.org

drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c

@@ -966,7 +966,7 @@ exit:
  * brcmf_p2p_remain_on_channel() - put device on channel and stay there.
  *
  * @wiphy: wiphy device.
- * @wiphy: wireless device.
+ * @wdev: wireless device.
  * @channel: channel to stay on.
  * @duration: time in ms to remain on channel.
  * @cookie: cookie.
@@ -2038,8 +2038,7 @@ static void brcmf_p2p_get_current_chanspec(struct brcmf_p2p_info *p2p,
 
 /**
  * Change a P2P Role.
- * Parameters:
- * @mac: MAC address of the BSS to change a role
+ * @cfg: driver private data for cfg80211 interface.
  * @if_type: interface type.
  * Returns 0 if success.
  */