Avoid unnecessary smaps logic during app compaction

ForEachVma can extract data from both maps and smaps files,
however the smaps logic is not used during app compaction.
Replace its usage with ForEachVmaFromMaps which reads only
maps file and skips any smaps logic.
This results in ~22% CPU usage reduction.

Test: Manual
Bug: 181174877

Signed-off-by: Edgar Arriaga <edgararriaga@google.com>
Change-Id: I165f211c2084676bc7872d190ffad14141f56ea8