ARM: dts: qcom: msm8974: re-add missing pinctrl

As part of a recent cleanup commit, the pinctrl for a few uart and i2c
nodes was removed. Adjust the names and/or add it back and assign it to
the uart and i2c nodes.

Fixes: 1dfe967e ("ARM: dts: qcom-msm8974*: Consolidate I2C/UART/SDHCI")
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220606160421.1641778-1-luca@z3ntu.xyz