lmkd: add missing libcutils library to test

lmkd's test depends on the socket_local_client() function from
libcutils, but since liblog also exposes this symbol weakly, that is
the symbol that gets used instead of the intended libcutil's copy of
the symbol.

Test: build
Change-Id: I294fa157a7f50881bf6360922419976eb1ee3ac7

tests/Android.bp

@@ -18,6 +18,7 @@ cc_test {
     shared_libs: [
         "libbase",
         "liblog",
+        "libcutils",
     ],
 
     static_libs: [