arm64: dts: qcom: sc7180: coachz: Add "dmic_clk_en"

This was present downstream. Add upstream too. NOTE: upstream I
managed to get some sort of halfway state and got one pinctrl entry in
the coachz-r1 device tree. Remove that as part of this since it's now
in the dtsi.

Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Cc: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
Cc: Ajit Pandey <ajitp@codeaurora.org>
Cc: Judy Hsiao <judyhsiao@chromium.org>
Cc: Cheng-Yi Chiang <cychiang@chromium.org>
Cc: Stephen Boyd <swboyd@chromium.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20210315133924.v2.1.I601a051cad7cfd0923e55b69ef7e5748910a6096@changeid


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>