Set GPU priorities + improved modeld priorities (#2691)

* give gpu threads rt priority

* modeld gets highest prio on core 2

* fix frame stream

* lower prio of cal thread

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: c57ee16e86275820f97631fb79df1685e914d564

common/realtime.py

@@ -21,9 +21,14 @@ else:
 
 
 class Priority:
-  MIN_REALTIME = 52 # highest android process priority is 51
-  CTRL_LOW = MIN_REALTIME
-  CTRL_HIGH = MIN_REALTIME + 1
+  # CORE 2
+  # - modeld = 55
+  # - camerad = 54
+  CTRL_LOW = 51 # plannerd & radard
+
+  # CORE 3
+  # - boardd = 55
+  CTRL_HIGH = 53
 
 
 def set_realtime_priority(level):