spi: spi-geni-qcom: Add support for SE DMA mode

Add support for SE DMA data transfer mode.
Each SE has its own DMA core that the driver
can setup data transfers.
This change also adds support to run in FIFO
mode if transfer length is less than FIFO size
else in SE-DMA mode.
This is applicable for non-shared SEs only,
meaning SE is assigned only to HLOS use.

Change-Id: I0dfd9e8a81a13f3de6fd8eb73e73d25166e4a282
Signed-off-by: Dilip Kota <dkota@codeaurora.org>