arm64: dts: qcom: sc7280: drop video decoder and encoder nodes

Decoder and encoder nodes are already deprecated from bindings. Update
the venus node to align with bindings. The nodes were deprecated with
commit 459997e8 ("media: dt-bindings: qcom-venus: Deprecate
video-decoder and video-encoder where applicable") and is part of
v6.14-rc1 and onwards.

Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20250303-b4-media-v2-1-893651a4b1c7@quicinc.com


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