Mux: fix a scenario with bad ANMF/FRGM size
Mux: fix a scenario with bad ANMF/FRGM size

When a ANMF/FRGM chunk size (read from file) is smaller than ANMF/FRGM header
size (which is constant and implicit), the parser should report an error.

Change-Id: I91d71889937f5133a97f1e83d5254cb2d7f37028

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