brcmsmac: make function wlc_phy_workarounds_nphy_rev1 static

The function wlc_phy_workarounds_nphy_rev1 is local to the source and
does not need to be in global scope, so make it static.

Cleans up sparse warning:
symbol 'wlc_phy_workarounds_nphy_rev1' was not declared. Should it
be static?
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c

@@ -16904,7 +16904,7 @@ static void wlc_phy_workarounds_nphy_rev3(struct brcms_phy *pi)
 	}
 }
 
-void wlc_phy_workarounds_nphy_rev1(struct brcms_phy *pi)
+static void wlc_phy_workarounds_nphy_rev1(struct brcms_phy *pi)
 {
 	static const u8 rfseq_rx2tx_events[] = {
 		NPHY_RFSEQ_CMD_NOP,