Mount debugfs /sys/kernel/debug with 755 permissions

Tracing functionality not able to access this directory

Bug: 30839723
Test: Use systrace
Change-Id: I50fbf9737b2dd3ebe73b09a745b7555e4365ca3b
(cherry picked from commit eb90ec3606642c7b5c627ae9549782bd3d5df103)
2 files changed