mmc: core: Add tracepoints to enhance pm debugging

Instrument the mmc core layer with tracepoints to aid in
debugging issues and identifying latencies in the following
paths:

* System suspend/resume
* Runtime suspend/resume

Reference:
26f187512: mmc: core: Add tracepoints to enhance pm debugging.

Change-Id: Ide21936718dd2d63084ab5f0f8e5d04edcd38c9e
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>