Add sepolicy for PCIe link statistics

PCIe link statistics collected by dumpstate and pixelstats.

Test: adb bugreport && unzip bugreport*.zip && grep link_stats dumpstate_board.txt;
      adb logcat "pixelstats-vendor:D *:S"
Bug: 264287533
Change-Id: I173ba399a60f29aa8a5edf1e86f97f214b4879c8
Signed-off-by: Doug Zobel <zobel@google.com>
4 files changed