UBUNTU: d-i: Add ehci_msm to usb-modules

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>

debian.master/d-i/modules/usb-modules

@@ -9,3 +9,4 @@ u132-hcd ?
 uhci-hcd ?
 xhci-hcd ?
 ehci-tegra ?
+ehci-msm ?