usb: Kconfig: make EHCI_MSM selectable for QCOM SOCs

This patch makes the msm ehci driver available to use on QCOM SOCs,
which have the same IP.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Felipe Balbi <balbi@ti.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>