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

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 459997e8990d9 ("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>