Start processes that need real-time with CAP_SYS_NICE.

Bug: 37293077
Test: verified CAP_SYS_NICE granted in /proc/pid/status
Change-Id: If404450cbeb077d331b231bda1af2d6eae774b75
diff --git a/camera/provider/2.4/default/android.hardware.camera.provider@2.4-service.rc b/camera/provider/2.4/default/android.hardware.camera.provider@2.4-service.rc
index 192870b..2bf309b 100644
--- a/camera/provider/2.4/default/android.hardware.camera.provider@2.4-service.rc
+++ b/camera/provider/2.4/default/android.hardware.camera.provider@2.4-service.rc
@@ -3,4 +3,5 @@
     user cameraserver
     group audio camera input drmrpc
     ioprio rt 4
-    writepid /dev/cpuset/camera-daemon/tasks /dev/stune/top-app/tasks
\ No newline at end of file
+    capabilities SYS_NICE
+    writepid /dev/cpuset/camera-daemon/tasks /dev/stune/top-app/tasks