dt-bindings: phy: qcom,qmp: clean up descriptions

Clean up the remaining descriptions by using uppercase "PHY"
consistently and dropping redundant information from the register
descriptions.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220830112923.3725-6-johan+linaro@kernel.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>