AppArmor: allow reading /proc/PID/{statm,smaps}

This is now needed at least for Firefox' memory reporter:
https://bugzilla.mozilla.org/show_bug.cgi?id=1647957

apparmor/torbrowser.Browser.firefox

@@ -46,7 +46,9 @@ profile torbrowser_firefox @{torbrowser_firefox_executable} {
   owner @{PROC}/@{pid}/environ r,
   owner @{PROC}/@{pid}/fd/ r,
   owner @{PROC}/@{pid}/mountinfo r,
+  owner @{PROC}/@{pid}/smaps r,
   owner @{PROC}/@{pid}/stat r,
+  owner @{PROC}/@{pid}/statm r,
   owner @{PROC}/@{pid}/status r,
   owner @{PROC}/@{pid}/task/*/stat r,
   @{PROC}/sys/kernel/random/uuid r,