arm: dts: dra7: add syscon node to cpsw to read mac address

Add syscon node to cpsw device node to read mac address
from efuse.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

arch/arm/dts/dra7.dtsi

@@ -1426,6 +1426,7 @@
 			active_slave = <0>;
 			cpts_clock_mult = <0x80000000>;
 			cpts_clock_shift = <29>;
+			syscon = <&scm_conf>;
 			reg = <0x48484000 0x1000
 			       0x48485200 0x2E00>;
 			#address-cells = <1>;