i3c: i3c-master-qcom-geni: Force the xfer mode as DMA mode

This change enables DMA mode for regular private transfers.
And forces FIFO mode for CCC and DAA operations.

We can selectively decide to switch between xfer modes later
which is based on data length of the transfer similar to i2c
way of xfer mode selection.

Change-Id: Iaa183d314ebd27c43e498b438d3791a6b716d1de
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>