libcutils: Move sched_policy functions into libprocessgroup

Move functions operating on cgroups from sched_policy.h in libcutils
into sched_policy_ctrl.h under libprocessgroup. This consolidates
cgroup-related functionality inside libprocessgroup.

Bug: 111307099
Test: builds, boots

Change-Id: Iba75f33281162b889989214d0325a5973d53ed2d
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
diff --git a/libcutils/tests/Android.bp b/libcutils/tests/Android.bp
index 7884190..72ae559 100644
--- a/libcutils/tests/Android.bp
+++ b/libcutils/tests/Android.bp
@@ -59,6 +59,7 @@
     "libcutils",
     "liblog",
     "libbase",
+    "libprocessgroup",
 ]
 
 cc_test {