ARM: dts: qcom: Add support for Huawei Watch

Add support for this smartwatch, based on Snapdragon 400 SoC.

Currently supported functionality:
* Internal storage
* USB
* Charger
* Power button
* Bluetooth
* Wifi

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220924152937.4076-2-luca@z3ntu.xyz