data-kernel: EMAC: Fix reset issue in ndo close

Keep PHY RX clock enabled in LPI mode.
Update the MAC GMII speed as per link speed.

Change-Id: Ic312fc1c6e40a11ee041b3b997b222326e84ed71
CRs-Fixed: 2284587
Acked-by: Rahul Kawadgave <rahulak@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>