arm64: dts: qcom: Extend msm8916 pinctrl device coverage

Create separate file for MSM8916 pinctrl default/sleep pins state
definitions. Move in UART2 states and add SPI, I2C and SDC configurations.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: Andy Gross <agross@codeaurora.org>