i2c-qcom-geni: Set DMA mask to support 64 bit DMA

Set DMA mask to 64 bit to support DMA address of range
64 bit.

Change-Id: I7e703044b8020f3c31431ff8782032a5d5357988
Signed-off-by: Shrey Vijay <shreyv@codeaurora.org>
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>