BugLink: http://bugs.launchpad.net/bugs/1599347

Add echi_msm to usb-modules to enable DI to detect USB on Qualcomm
EHCI host controller.
Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>