At ag/13473071 we expose C2BufferQueueBlockPoolData at
C2BqBufferPriv.h, which needs C2BlockInternal.h header. This CL adds
the corresponding header_libs at plugin_store because it includes
C2BqBufferPriv.h.

Bug: 174188958
Test: m -j32

Change-Id: I0eec5db85b6d7d05ad97df142cb61a9ea2adbe76