msm: emac: simplify log macros

Log macros use two levels of preprocessing and assume a strict
naming convention at the caller side. This is simplified here
to a single level and obviates the naming assumption.

Change-Id: Ie1fdf84f809d2236bdadd94154b6a3d49540f260
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>