dt-bindings: arm: qcom: split MSM8974 Pro and MSM8974

The MSM8974 Pro (AC) and bare MSM8974 are slightly different platforms.
Split the compat strings accordingly to clearly specify the platform
used by the device.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221128131550.858724-1-dmitry.baryshkov@linaro.org