mips: octeon: dts/dtsi: Change UART DT node to use clocks property

We already have a clock driver for MIPS Octeon. This patch changes the
Octeon DT nodes to supply the clock property via the clock driver
instead of using an hard-coded value, which is not correct in all cases.
Signed-off-by: NAaron Williams <awilliams@marvell.com>
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Chandrakala Chavva <cchavva@marvell.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

arch/mips/dts/mrvl,cn73xx.dtsi

@@ -97,6 +97,7 @@
 		uart0: serial@1180000000800 {
 			compatible = "cavium,octeon-3860-uart","ns16550";
 			reg = <0x11800 0x00000800 0x0 0x400>;
+			clocks = <&clk OCTEON_CLK_IO>;
 			clock-frequency = <0>;
 			current-speed = <115200>;
 			reg-shift = <3>;
@@ -106,6 +107,7 @@
 		uart1: serial@1180000000c00 {
 			compatible = "cavium,octeon-3860-uart","ns16550";
 			reg = <0x11800 0x00000c00 0x0 0x400>;
+			clocks = <&clk OCTEON_CLK_IO>;
 			clock-frequency = <0>;
 			current-speed = <115200>;
 			reg-shift = <3>;

arch/mips/dts/mrvl,octeon-ebb7304.dts

@@ -112,10 +112,6 @@
 	};
 };
 
-&uart0 {
-	clock-frequency = <1200000000>;
-};
-
 &i2c0 {
 	u-boot,dm-pre-reloc;	/* Needed early for DDR SPD EEPROM */
 	clock-frequency = <100000>;