data-kernel: EMAC: Add hibernation mode support.

Update EMAC driver to support hibernation mode support.
Bring down interface on hibernation mode and up on exi

Change-Id: I20591969a56fb30c0a13be617f519bb43119f27d
Acked-by: Rahul Kawadgave <rahulak@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>