arm64: dts: qcom: sa8775p: Add ep pcie1 controller node

Add ep pcie dtsi node for pcie1 controller found on sa8775p platform.
It supports gen4 and x4 link width. Limiting the speed to Gen3 due to
stability issue with Gen4.

Signed-off-by: Mrinmay Sarkar <quic_msarkar@quicinc.com>
Link: https://lore.kernel.org/r/1714494089-7917-3-git-send-email-quic_msarkar@quicinc.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>