usb: gadget: Add Interface Association Descriptor to ECM
usb: gadget: Add Interface Association Descriptor to ECM

Add IAD to bind the two interfaces of ECM so that it works properly
in composite gadget mode.

Signed-off-by: Thirupathi <dd29c450f4f06caeae543d79aa373a8119501345@stericsson.com>
Signed-off-by: Praveena Nadahally <d4a821a029ad84a46bb913c3ea6d7faebfe1763d@stericsson.com>
Signed-off-by: Linus Walleij <9cd9d802d23c0ed5e224beabf4ae4a5c478746ef@linaro.org>
Signed-off-by: Felipe Balbi <94dddeeef08b001e003cce128ddc162a4e2c6cd2@ti.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas