ARM: dts: msm: EMAC phy addr

This change add support to provide the phy address in dtsi file
so that it can be used for early ethernet for fast phy detection.

Change-Id: I088ce002bbc03bb86a2d5ed58e971dece3566567
Acked-by: Suraj Jaiswal <jsuraj@codeaurora.org>
Signed-off-by: Suraj Jaiswal <jsuraj@codeaurora.org>