i2c: qcom: geni: Use GSI DMA-engine if FIFO is disabled

FIFO or SE DMA mode can't be used if FIFO interface is disabled.
Use GSI DMA-Engine through GPI driver interface for I2C transactions
in that case.

Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Change-Id: I5336984df0e29d067ca2a8486995d8f586ec12f6