mediaextractor: Replace writepid with task_profiles command for cgroup migration

writepid command usage to join a cgroup has been deprecated in favor
of a more flexible approach using task_profiles. This way cgroup path
is not hardcoded and cgroup changes can be easily made. Replace
writepid with task_profiles command to migrate between cgroups.

Bug: 191283136
Test: build and boot
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: If6ba163bce26ea2275a63b5b3e6d2fc48adedd09
diff --git a/services/mediaextractor/mediaextractor.rc b/services/mediaextractor/mediaextractor.rc
index 5fc2941..4fb50d0 100644
--- a/services/mediaextractor/mediaextractor.rc
+++ b/services/mediaextractor/mediaextractor.rc
@@ -3,4 +3,4 @@
     user mediaex
     group drmrpc mediadrm
     ioprio rt 4
-    writepid /dev/cpuset/foreground/tasks
+    task_profiles ProcessCapacityHigh