b43: Remove empty function lpphy_papd_cal()

In commit d825db346270e ("b43: shut up clang -Wuninitialized variable
warning"), the message noted that function lpphy_papd_cal() was empty
and had an old TODO regarding its implementation. As the reverse
engineering project that created the LP-PHY version of this driver
has not been active for some time, it is safe to remove this empty
function.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/b43/phy_lp.c

@@ -1826,12 +1826,6 @@ static void lpphy_stop_tx_tone(struct b43_wldev *dev)
 }
 
 
-static void lpphy_papd_cal(struct b43_wldev *dev, struct lpphy_tx_gains gains,
-			   int mode, bool useindex, u8 index)
-{
-	//TODO
-}
-
 static void lpphy_papd_cal_txpwr(struct b43_wldev *dev)
 {
 	struct b43_phy_lp *lpphy = dev->phy.lp;
@@ -1848,11 +1842,6 @@ static void lpphy_papd_cal_txpwr(struct b43_wldev *dev)
 
 	lpphy_set_tx_power_control(dev, B43_LPPHY_TXPCTL_OFF);
 
-	if (dev->dev->chip_id == 0x4325 && dev->dev->chip_rev == 0)
-		lpphy_papd_cal(dev, oldgains, 0, 1, 30);
-	else
-		lpphy_papd_cal(dev, oldgains, 0, 1, 65);
-
 	if (old_afe_ovr)
 		lpphy_set_tx_gains(dev, oldgains);
 	lpphy_set_bb_mult(dev, old_bbmult);