libmeminfo: Add support to fiter accounting based on page flags

Bug: 114325007
Bug: 111694435
Test: libmeminfo_test 1 --gtest_filter=ValidateProcMemInfoFlags.*

Change-Id: Ifa7006de78dd909b5b4db282a8c9931ebf97a68a
Signed-off-by: Sandeep Patil <sspatil@google.com>
3 files changed