msm: eth: Add user space interface for eth

Add user space interface using structure.
Add messages for apps to read IPA connection state.

Change-Id: Ia11be481e17b450e65d030a7ccc458bf20c164f6
Acked-by: Rahul Kawadgave <rahulak@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>