This bug does not affect any users currently since AcceleratedCrcMemcpyEngine
is never configured with a single region currently.

Before this CL, if the number of regions for the AcceleratedCrcMemcpyEngine was
set to one, the CRC for the sole region would be incorrectly concatenated onto
itself and corrupted.

PiperOrigin-RevId: 561663848
Change-Id: Ibfc596306ab07db906d2e3ecf6eea3f6cb9f1b2b