Bug#37063288 AppArmor denies access to files /proc/self/task/<tid>/mem

Backport to 5.7.49.

Access to /proc/$pid/task/$thread_id/mem is required by stacktrace
code.

Change-Id: I6b6f8dd5c07ae5e867e0358fcbeccd5c5cd29bde

Author: trosten

packaging/deb-in/extra/apparmor-profile

@@ -12,6 +12,7 @@
   /sys/devices/system/node/ r,
   /sys/devices/system/node/** r,
   /proc/*/status r,
+  /proc/*/mem r,
   capability sys_resource,
   capability dac_override,
   capability setuid,