ARM: dts: socfpga: set the i2c frequency

Use 'clock-frequency' binding for the i2c node that will put the I2C driver
into the standard operating mode. 'speed-mode' was not a valid binding for
the I2C driver, remove it.
Signed-off-by: NAlan Tull <atull@kernel.org>
Signed-off-by: NDinh Nguyen <dinguyen@kernel.org>

arch/arm/boot/dts/socfpga_arria10_socdk.dtsi

@@ -130,13 +130,13 @@
 };
 
 &i2c1 {
-	speed-mode = <0>;
 	status = "okay";
 
 	/*
 	 * adjust the falling times to decrease the i2c frequency to 50Khz
 	 * because the LCD module does not work at the standard 100Khz
 	 */
+	clock-frequency = <100000>;
 	i2c-sda-falling-time-ns = <6000>;
 	i2c-scl-falling-time-ns = <6000>;
 

arch/arm/boot/dts/socfpga_cyclone5_de0_sockit.dts

@@ -86,7 +86,7 @@
 
 &i2c0 {
 	status = "okay";
-	speed-mode = <0>;
+	clock-frequency = <100000>;
 
 	adxl345: adxl345@0 {
 		compatible = "adi,adxl345";

arch/arm/boot/dts/socfpga_cyclone5_mcvevk.dts

@@ -58,7 +58,7 @@
 
 &i2c0 {
 	status = "okay";
-	speed-mode = <0>;
+	clock-frequency = <100000>;
 
 	stmpe1: stmpe811@41 {
 		compatible = "st,stmpe811";