ncsi: Impelment the setChannel/ClearInterface function

SetChannel:This function will ask underlying NCSI driver
to set the package or package/channel combination as the
preferred choice.

ClearInterface:This function clears any preferred setting
from the specific interface.

These functions talks with the NCSI driver through
the netlink messages.

Change-Id: Icb5ae35f83b5b0d0f9654ff4a0dd568fe10680a7
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
4 files changed