dt-bindings: soc: qcom: apr: Use generic node names for APR services

Device nodes should be named according to the class of devices
they belong to. Change the suggested names of the subnodes to
apr-service@<id>, which is already in use in
arch/arm64/boot/dts/qcom/sdm845.dtsi.

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200415081159.1098-2-stephan@gerhold.net
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>