Remove car-ui-lib-plugin dependency from CarUILibUnitTests

to avoid including the car-ui-lib-plugin.apk when device-tests are also
built at the same time.

Bug: 227483467
Test: m -j does not fail
Test: next day's release build should not contain the
car-ui-lib-plugin.apk (only the prebuilt version)

Change-Id: Ifc122deaaed9254a64538b53cee8dba45b33f963
1 file changed