Allow configEcm to lookup for configfs-type gadgets
Allow configEcm to lookup for configfs-type gadgets

With Kernel 4.14, ecm is visible as a configfs gadget under
/sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x4
09/configuration. Update configEcm to search this path if the lookup for
android gadgets on sys/class/android_usb/android0/functions fails.

Resolves: LE-15202
Change-Id: Id968856068e610e1d7bec0b8390def60c50e49a6
Signed-off-by: Anju Kunjumon <dbb7adda0ef4f1f0f8d6226fb374386d3cbdc198@sierrawireless.com>
(cherry picked from commit b20d894e15bb2888641e95e8542aa728c9610aa1)

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af