libbatteryservice_headers: export libutils_headers

Fixes build error.
Test: cd hardware/interfaces/health/1.0 && mma -j

Change-Id: Id48f7d6902f35d30d76a24146ec465b8e65188e4
Merged-In: Id48f7d6902f35d30d76a24146ec465b8e65188e4
(cherry picked from commit eddca62d2a4b8455fa189983716a0de9d440325b)
1 file changed