ARM: tegra: nexus7: Drop clock-frequency from NFC node

The clock-frequency property was never used and is deprecated now.
Remove it from Nexus 7 device-tree.
Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-asus-nexus7-grouper.dtsi

@@ -137,7 +137,6 @@ i2c@7000c500 {
 		nfc@28 {
 			compatible = "nxp,pn544-i2c";
 			reg = <0x28>;
-			clock-frequency = <100000>;
 
 			interrupt-parent = <&gpio>;
 			interrupts = <TEGRA_GPIO(X, 0) IRQ_TYPE_EDGE_RISING>;

arch/arm/boot/dts/tegra30-asus-nexus7-tilapia.dtsi

@@ -223,8 +223,6 @@ nfc@2a {
 			compatible = "nxp,pn544-i2c";
 			reg = <0x2a>;
 
-			clock-frequency = <100000>;
-
 			interrupt-parent = <&gpio>;
 			interrupts = <TEGRA_GPIO(S, 7) IRQ_TYPE_EDGE_RISING>;