r8169: remove unused interrupt sources

Setting PCSTimeout interrupt source was copied from the vendor driver
which uses the chip programmable timer interrupt. The mainline driver
doesn't use this timer interrupt.

SYSErr indicates a PCI error and isn't defined on the PCIe models.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169.c

@@ -5389,7 +5389,7 @@ static void rtl_hw_start_8168(struct rtl8169_private *tp)
 
 	/* Work around for RxFIFO overflow. */
 	if (tp->mac_version == RTL_GIGA_MAC_VER_11) {
-		tp->event_slow |= RxFIFOOver | PCSTimeout;
+		tp->event_slow |= RxFIFOOver;
 		tp->event_slow &= ~RxOverflow;
 	}
 
@@ -7027,15 +7027,14 @@ static const struct rtl_cfg_info {
 	},
 	[RTL_CFG_1] = {
 		.hw_start	= rtl_hw_start_8168,
-		.event_slow	= SYSErr | LinkChg | RxOverflow,
+		.event_slow	= LinkChg | RxOverflow,
 		.has_gmii	= 1,
 		.coalesce_info	= rtl_coalesce_info_8168_8136,
 		.default_ver	= RTL_GIGA_MAC_VER_11,
 	},
 	[RTL_CFG_2] = {
 		.hw_start	= rtl_hw_start_8101,
-		.event_slow	= SYSErr | LinkChg | RxOverflow | RxFIFOOver |
-				  PCSTimeout,
+		.event_slow	= LinkChg | RxOverflow | RxFIFOOver,
 		.coalesce_info	= rtl_coalesce_info_8168_8136,
 		.default_ver	= RTL_GIGA_MAC_VER_13,
 	}