ARM: socfpga: arria10: Add ptp_ref clock to ethernet nodes

The ptp_ref clock for Arria10 defaults to using the peripheral
pll emac ptp clock.  Without the ptp_ref clock in the gmac nodes
the driver defaults to the gmac main clock resulting in an
incorrect period for the ptp counter.
Signed-off-by: Dalon Westergreen <dalon.westergreen@linux.intel.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm/boot/dts/socfpga_arria10.dtsi

@@ -431,8 +431,8 @@ gmac0: ethernet@ff800000 {
 			snps,perfect-filter-entries = <128>;
 			tx-fifo-depth = <4096>;
 			rx-fifo-depth = <16384>;
-			clocks = <&l4_mp_clk>;
-			clock-names = "stmmaceth";
+			clocks = <&l4_mp_clk>, <&peri_emac_ptp_clk>;
+			clock-names = "stmmaceth", "ptp_ref";
 			resets = <&rst EMAC0_RESET>, <&rst EMAC0_OCP_RESET>;
 			reset-names = "stmmaceth", "stmmaceth-ocp";
 			snps,axi-config = <&socfpga_axi_setup>;
@@ -451,8 +451,8 @@ gmac1: ethernet@ff802000 {
 			snps,perfect-filter-entries = <128>;
 			tx-fifo-depth = <4096>;
 			rx-fifo-depth = <16384>;
-			clocks = <&l4_mp_clk>;
-			clock-names = "stmmaceth";
+			clocks = <&l4_mp_clk>, <&peri_emac_ptp_clk>;
+			clock-names = "stmmaceth", "ptp_ref";
 			resets = <&rst EMAC1_RESET>, <&rst EMAC1_OCP_RESET>;
 			reset-names = "stmmaceth", "stmmaceth-ocp";
 			snps,axi-config = <&socfpga_axi_setup>;
@@ -471,8 +471,8 @@ gmac2: ethernet@ff804000 {
 			snps,perfect-filter-entries = <128>;
 			tx-fifo-depth = <4096>;
 			rx-fifo-depth = <16384>;
-			clocks = <&l4_mp_clk>;
-			clock-names = "stmmaceth";
+			clocks = <&l4_mp_clk>, <&peri_emac_ptp_clk>;
+			clock-names = "stmmaceth", "ptp_ref";
 			resets = <&rst EMAC2_RESET>, <&rst EMAC2_OCP_RESET>;
 			reset-names = "stmmaceth", "stmmaceth-ocp";
 			snps,axi-config = <&socfpga_axi_setup>;