Revert "Revert "dts: msm8974: Add dma channels for blsp2_i2c1 node""

This adds back the dma channels for the i2c1 node.  This is safe now
that the qcom,controlled-remotely changes are in place and will be used
on the boards that require it.

This reverts commit 10c0f0e9.

arch/arm/boot/dts/qcom-msm8974.dtsi

@@ -501,6 +501,8 @@
 			clock-names = "core", "iface";
 			#address-cells = <1>;
 			#size-cells = <0>;
+			dmas = <&blsp2_dma 20>, <&blsp2_dma 21>;
+			dma-names = "tx", "rx";
 		};
 
 		spmi_bus: spmi@fc4cf000 {