ANDROID: gki - enable CONFIG_USB_CONFIGFS_{EEM,ECM}=y

CDC ECM, EEM, NCM are USB standard networking protocols,
in chronological order from oldest to newest:
  ECM - Ethernet Control Model
  EEM - Ethernet Emulation Model
  NCM - Network Control Model

The NCM gadget is already enabled, so also enable the older
more widely compatible modes.

Test: built and booted on a gki using phone
Bug: 183564444
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I193772309cd08fd1d4a545d33be79af7b56b897a
(cherry picked from commit ebab44be)