ARM: dts: msm: Add GSI DMA channels for I2C instances on sdm670

GSI will be used if FIFO is disabled. Add GSI DMA channels for all I2C
instances for sdm670.

Change-Id: Ic0147a8e83a6ca9b30f2793ce164cf62ae397a11
Signed-off-by: Shrey Vijay <shreyv@codeaurora.org>