Fix build errors

- hal/Android.mk: set_sched_policy() was moved from libcutils to libprocessgroup

Change-Id: I97b04edc55e457c0572c67bf16801cc3b9366d06
diff --git a/hal/Android.mk b/hal/Android.mk
index 4f823ef..e51df5e 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -359,7 +359,8 @@
     libqti_vndfwk_detect \
     libhwbinder \
     libhidlbase \
-    libhidltransport
+    libhidltransport \
+    libprocessgroup
 
 LOCAL_C_INCLUDES += \
     external/tinyalsa/include \