arm64: dts: qcom: msm8996: align bus node names with DT schema

The node names should be generic and the bindings expect "bus" for
simple-bus nodes:

  msm8996-mtp.dtb: agnoc@0: $nodename:0: 'agnoc@0' does not match '^bus(@[0-9a-f]+)?$'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221224154255.43499-1-krzysztof.kozlowski@linaro.org