arm64: tegra: smaug: Remove reg-shift for high-speed UART

The device tree bindings for the high-speed UART don't define a
reg-shift property, so delete it.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210-smaug.dts

@@ -1320,6 +1320,7 @@ serial@70006000 {
 	uartd: serial@70006300 {
 		compatible = "nvidia,tegra30-hsuart";
 		reset-names = "serial";
+		/delete-property/ reg-shift;
 		status = "okay";
 
 		bluetooth {