arm64: defconfig: Enable Qualcomm PCIe Gen2 PHY

The Qualcomm QCS404 platform uses the PCIe Gen2 PHY, enable the driver
for this to ensure that PCIe is functional.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lore.kernel.org/r/20220217040205.1898644-1-bjorn.andersson@linaro.org