soc: qcom: smd: Make callback pass channel reference

soc: qcom: smd: Make callback pass channel reference

By passing the smd channel reference to the callback, rather than the
smd device, we can open additional smd channels from sub-devices of smd
devices.

Also updates the two smd clients today found in mainline.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
(cherry picked from commit b853cb9628bfbcc4017da46d5f5b46e3eba9d8c6)