Add group ID for reading tracefs

Add AID_READTRACEFS and mount tracefs with gid=AID_READTRACEFS

Bug: 209513178
Bug: 214061655
Test: adb shell ls -l /sys/kernel/tracing/events
Change-Id: Ibbfdf8a4b771bd7520ecbaaf15a1153d6bf0e599
Merged-In: Ibbfdf8a4b771bd7520ecbaaf15a1153d6bf0e599
2 files changed