phy: qcom-qmp-pcie: fix ipq6018 initialisation

The phy_status mask was never set for IPQ6018 which meant that the
driver would not wait for the PHY to be initialised during power-on and
would never detect PHY initialisation timeouts.

Fixes: 520264db ("phy: qcom-qmp: add QMP V2 PCIe PHY support for ipq60xx")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>