msm: emac: EMAC Gigabit Ethernet Controller driver snapshot

Copy the EMAC Ethernet driver from 3.10 to 3.18 in this snapshot patch.
The EMAC driver supports following features.
1) Precision Time Protocol (PTP) support.
2) Receive Side Scaling (RSS).
3) Checksum offload.
4) Multiple PHY support on MDIO bus.
5) Runtime power management support.
6) Interrupt coalescing support.
7) SGMII direct connection without external phy.
8) RGMII phy support.

Change-Id: I7b67b49216523b429c70c91b7b037c83fd6327b0
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>
Signed-off-by: Niranjana Vishwanathapura <nvishwan@codeaurora.org>
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Acked-by: Jie Luo <jluo@qti.qualcomm.com>
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>