r8169: read common register for PCI commit

RTL8125 uses a different register number for IntrMask.
To net have side effects by reading a random register let's
use a register that is the same on all supported chip families.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -5135,7 +5135,7 @@ static void rtl_hw_start(struct  rtl8169_private *tp)
 	rtl_lock_config_regs(tp);
 
 	/* Initially a 10 us delay. Turned it into a PCI commit. - FR */
-	RTL_R8(tp, IntrMask);
+	RTL_R16(tp, CPlusCmd);
 	RTL_W8(tp, ChipCmd, CmdTxEnb | CmdRxEnb);
 	rtl_init_rxcfg(tp);
 	rtl_set_tx_config_registers(tp);