ANDROID: GKI: virtual_device: add usb_find_common_endpoints to symbol list

In commit b6109556 ("can: gs_usb: add usb endpoint address detection
at driver probe step"), the usb_find_common_endpoints() function is now
called in the gs_usb module so add it to the symbol list to fix the
build.

Fixes: b6109556 ("can: gs_usb: add usb endpoint address detection at driver probe step")
Change-Id: Ib8a245d3ca6e6e72852892a686335f42ab5ba6fd
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>