arm64: dts: qcom: sm8250-samsung-r8q: Move common parts to dtsi

arm64: dts: qcom: sm8250-samsung-r8q: Move common parts to dtsi

Move common parts of the device tree to a separate dtsi in preparation for
adding other Samsung devices from the S20, Tab S7 or Note 20 families,
creating sm8250-samsung-common.dtsi. Also add support for UFS, USB and
GPIO keys.

Signed-off-by: Eric Gonçalves <ghatto404@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250905190931.27481-2-ghatto404@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>