usb: host: ehci-msm: Add support for ACPI probing

Allow the EHCI MSM driver to probe against an ACPI enumerated
device with ID QCOM8040.

Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>