Revert "i2c: qcom-geni: Disable DMA processing on the Lenovo Yoga C630"

A combination of recent bug fixes by Doug Anderson and the proper
definition of iommu streams means that this hack is no longer needed.
Let's clean up the code by reverting '127068ab ("i2c: qcom-geni:
Disable DMA processing on the Lenovo Yoga C630")'.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Caleb Connolly <caleb@connolly.tech>
Tested-by: Steev Klimaszewski <steev@kali.org>
Reviewed-by: Akash Asthana <akashast@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>