Add binderAllocationsLimit test for binder call with string vec

We have one allocation for writing the interface token, one for resizing
the output vector, and the rest of the allocations come from reading the
reply parcel into the output vector.

Flag: EXEMPT test only
Test: atest binderAllocationLimits
Bug: none
Change-Id: Icfb26fa4a8b93962ae97c8ff7286e3a50770fd78