Allow reading system ION heap size from debugfs

This grants access for system server to read system ION heap size from
debugfs on all builds.
Experiments on userdebug builds show that large ION heap is correlated
with severe LMKs. This CL will help confirm the finding on bigger
population.

Bug: 139283562
Test: m -j
Change-Id: I68f90149a228bcc6f9de25f1e69565cabf173c41
1 file changed
tree: 0aa1a61e754624de78b6b6bdac3bc5726fa86299
  1. private/
  2. public/
  3. vendor/
  4. crosshatch-sepolicy.mk
  5. OWNERS