msm: kgsl: add userspace memory alloc and free tracepoints

Add events for tracking memory operations by userspace
clients: kgsl_mem_alloc, kgsl_mem_map, kgsl_mem_free,
kgsl_mem_timestamp_queue (adding an entry to the free
on timestamp list) and kgsl_mem_timestamp_free (when
the memory is actually freed).

Change-Id: Id62eec30ea20a0f00f7a7a791c7e5b8dfad487af
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>