arm64/dts: qcom: Fix 'dma' & 'qcom,controlled-remotely' nodes in dts

Preparatory patch for subsequent patch in this series which
converts the qcom_bam_dma device-tree binding into YAML format.

A few qcom device-tree files define dma-controller nodes
with non-standard 'node names' and also set
the bool property 'qcom,controlled-remotely' incorrectly, which
leads to following errors with 'make dtbs_check':

 $ arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dt.yaml:
     dma@1dc4000: $nodename:0: 'dma@1dc4000' does not match
     '^dma-controller(@.*)?$'

 $ arch/arm64/boot/dts/qcom/sm8250-mtp.dt.yaml:
     dma@1dc4000: qcom,controlled-remotely: 'oneOf' conditional
     failed, one must be fixed:
	[[1]] is not of type 'boolean'
	True was expected
	[[1]] is not of type 'null'

Fix the same.

Cc: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>