msm: emac: Add new SGMII controller support

A separate phy initialization function is added to support the new SGMII
controller. This patch introduces the version concept to call HW specific
initialization routines at runtime. The phy version can be specified
through the _DSD/DTS property "phy-version".

Change-Id: I6bce468db0d9934fbbc32b78a4a7ee4ae4b9707e
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>