libprocessgroup: use libcgrouprc to read cgroup.rc

Use the LL-NDK library to read cgroup.rc.

As a side-effect, the CgroupController class is changed
to a wrapper of ACgroupController* from the library. The
class itself essentially becomes the pointer, and can be
trivially copied. Modify all client code for this change.

Test: builds and boots
Bug: 123664216

Change-Id: I635d9885db62e82f37421f6d20f59c84a6f4cbb2
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index a27ecef..619bc56 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -235,6 +235,7 @@
     "libbase",
     "libjsoncpp",
     "libprocessgroup",
+    "libcgrouprc",
 ]
 
 cc_test {
@@ -249,7 +250,10 @@
     name: "libcutils_test_static",
     test_suites: ["device-tests"],
     defaults: ["libcutils_test_default"],
-    static_libs: ["libc"] + test_libraries,
+    static_libs: [
+        "libc",
+        "libcgrouprc_format",
+    ] + test_libraries,
     stl: "libc++_static",
 
     target: {