Extend getPssPid to report itemized memtrack values

Currently getPssPid includes memtrack HAL reported values in the pss
calculation. This makes it impossible to get these values separately.
Extend this interface to include itemized memtrack values.

Bug: 165832481
Test: dumpsys meminfo
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ieb7e1b79ad8ecae6023338d9992467952558e2bd