sched_policy_test: set_sched_policy also set the cpuset policy as fallback

get_sched_policy uses the cpuset policy as fallback if the cpu cgroup
is not recognized.  Pixel is currently not using the cpu cgroup for
background policy due to b/208895940.

Bug: 265852986
Test: atest libcutils_test:libcutils_test.SchedPolicy#set_sched_policy -- --abi arm64-v8a
Change-Id: Ia77ace7513c48b1a14290c6ecc0222b46d6bf927
Signed-off-by: Edward Liaw <edliaw@google.com>
diff --git a/libcutils/sched_policy_test.cpp b/libcutils/sched_policy_test.cpp
index b9e2832..50bd6d0 100644
--- a/libcutils/sched_policy_test.cpp
+++ b/libcutils/sched_policy_test.cpp
@@ -75,9 +75,11 @@
     }
 
     ASSERT_EQ(0, set_sched_policy(0, SP_BACKGROUND));
+    ASSERT_EQ(0, set_cpuset_policy(0, SP_BACKGROUND));
     AssertPolicy(SP_BACKGROUND);
 
     ASSERT_EQ(0, set_sched_policy(0, SP_FOREGROUND));
+    ASSERT_EQ(0, set_cpuset_policy(0, SP_FOREGROUND));
     AssertPolicy(SP_FOREGROUND);
 }