soc: qcom: mem-buf: Add tracepoints and augment logging

Add tracepoints for the mem-buf driver to collect a sequence of
events, as well as state to ascertain how much progress the
allocation process makes.

Change-Id: Icc8884d66655e21dd704266e7bc06264858bf527
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>