ARM: dts: qcom: Add support for LG G Watch R

Add a device tree for the LG G Watch R smartwatch, manufactured by LG
Electronics and based on the msm8226 platform (apq8026).

Currently UART, internal storage, power button and touchscreen are
supported.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
[bjorn: Moved "rpm_requests" before "sdhc", to keep things sorted]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210911232707.259615-9-luca@z3ntu.xyz