Export more files in proc_perf.

Export /proc/sys/kernel/perf_cpu_time_max_percent and
/proc/sys/kernel/perf_event_mlock_kb in proc_perf. So
they can be read in shell and written by init.

This is needed by simpleperf to control cpu percent and
memory used for profiling.

Bug: 110706031
Test: build and boot hikey960 successfully.

Change-Id: I2a01f583508003ab73427bab30a7982a27dfa677

private/genfs_contexts

@@ -46,6 +46,8 @@ genfscon proc /sys/kernel/modules_disabled u:object_r:proc_security:s0
 genfscon proc /sys/kernel/panic_on_oops u:object_r:proc_panic:s0
 genfscon proc /sys/kernel/perf_event_max_sample_rate u:object_r:proc_perf:s0
 genfscon proc /sys/kernel/perf_event_paranoid u:object_r:proc_perf:s0
+genfscon proc /sys/kernel/perf_cpu_time_max_percent u:object_r:proc_perf:s0
+genfscon proc /sys/kernel/perf_event_mlock_kb u:object_r:proc_perf:s0
 genfscon proc /sys/kernel/pid_max u:object_r:proc_pid_max:s0
 genfscon proc /sys/kernel/poweroff_cmd u:object_r:usermodehelper:s0
 genfscon proc /sys/kernel/random u:object_r:proc_random:s0