arm64: dts: qcom: add QCM6490 SHIFTphone 8

The SHIFTphone 8 is an upcoming QCM6490 smartphone, it has the following
features:

* 12GB of RAM, 512GB UFS storage
* 1080p display.
* Hardware kill switches for cameras and microphones
* UART access via type-c SBU pins (enabled by an internal switch)

Initial support includes:

* Framebuffer display
* UFS and sdcard storage
* Battery monitoring and USB role switching via pmic glink
* Bluetooth
* Thermals
* Wifi

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
Reviewed-by: Luca Weiss <luca.weiss@fairphone.com>
Link: https://lore.kernel.org/r/20240530-otter-bringup-v3-2-79e7a28c1b08@linaro.org


[bjorn: Fixed indent of block comments]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>