data-kernel: EMAC: Keep advertisement options from phy driver.

Don't set more advertisement features than the PHY
supports. Use basic GBIT and default features based
on the connection type. Rely on the PHY driver for
the remaining advertisement options.

Change-Id: I98e9b8d8db10e2ea55f1265d9e173b76237c4427
Signed-off-by: Sunil <Paidimarri&lt;hisunil@codeaurora.org>
Signed-off-by: Chaitanya <Pratapa&lt;cpratapa@codeaurora.org>