put back the unused virtuals in Vector<>

some binaries are using these private APIs and broke
(as they should!) with this change. Temporarily restore the
virtuals to work around this.

Bug: 6977550
Change-Id: I7c37f24b16e4d586b89205c493db5169cf87e024
libnl_2: Add nl_wait_for_ack API

Adding nl_wait_for_ack API which is used by CRDA.

Change-Id: If744f2fb6c0ff04e5ac3fa269f95178a387d5661
Signed-off-by: Vishal Mahaveer <a0271468@ti.com>