dt-bindings: hwlock: qcom: Remove invalid binding

dt-bindings: hwlock: qcom: Remove invalid binding

The Qualcomm hwlock is described in DeviceTree either directly on the
mmio bus or split between a syscon and a mutex node, but as noted in
[1] the latter is not valid DT, so remove any traces of this from the
binding.

[1] https://lore.kernel.org/r/CAL_JsqLa9GBtbgN6aL7AQ=A6V-YRtPgYqh6XgM2kpx532+r4Gg@mail.gmail.com/

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200729004757.1901107-1-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>