ARM: dts: msm: Add GPI DMA device tree nodes for sdm670

Add GPI device tree nodes for GPI DMA driver. The driver
provides DMA capabilities for peripheral buses such as
I2C, UART, and SPI.

Change-Id: I828dd9f51456e8109a904659aa9f35854f4a84b7
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>