arm64: dts: qcom: sm4250: Add support for oneplus-billie2

Add initial support for OnePlus Nord N100, based on SM4250. Currently
working:
- boots
- usb
- built-in flash storage (UFS)
- SD card reader

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220919180618.1840194-9-iskren.chernev@gmail.com