arm64: dts: qcom: sm6115: Move SDHC node(s)'s 'pinctrl' properties to dts

Normally the 'pinctrl' properties of a SDHC controller and the
chip detect pin settings are dependent on the type of the slots
(for e.g uSD card slot), regulators and GPIO(s) available on the
board(s).

So, move the same from the sm6115 dtsi file to the respective
board file(s).

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230314074001.1873781-1-bhupesh.sharma@linaro.org