arm64: dts: qcom: msm8996: add support for oneplus3(t)

Add initial support for OnePlus 3 and 3T mobile phones. They are based
on the MSM8996 SoC.

Co-developed-by: Yassine Oudjana <y.oudjana@protonmail.com>
Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Signed-off-by: Harry Austen <hpausten@protonmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221023204505.115141-5-hpausten@protonmail.com