Put composer 2.3 in the right cpuset.

the composer HAL should be in the system-background cpuset, but hwc 2.3 is not
in any cpuset. This patch restricts it to system-background.

BUG: 132559090
Test: Build, flash and boot.
Change-Id: I1739a6c049e195f6cc79b81fcba7a6fcb55b546a
1 file changed