phy: qcom-qmp-pcie: shorten function prefixes

The driver function prefix has gotten unnecessarily long and hurts
readability.

Shorten "qcom_qmp_phy_" to "qmp_" (which likely stands for "Qualcomm
Multi PHY" or similar anyway).
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220906074550.4383-3-johan+linaro@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>