arm64: dts: qcom: qrb4210-rb2: Add SD pinctrl states

Add the default and sleep pinctrl states for SDHC1 & 2 controllers
on QRB4210 RB2 board.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230516075908.2323372-2-bhupesh.sharma@linaro.org