Qualcomm DTS updates for v5.16

This extends the previous limited description of MSM8226 with SDHC,
UART, I2C, SCM, SMEM, RPM and basic PMIC definitions. Based on this,
initial support for the LG G Watch R smartwatch is introduced.

APQ8064 gets a couple of DT updates, one which will allow the GPU driver
to drop supporting legacy "opp tables" in the future.

DT bindings and DTS files are updated with additional compatibles, for
completeness.
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