mpeg4dec: Check for invalid quant matrix

Add a check to ensure quant matrix has at least one non-zero
value parsed.

Bug: 173320193
Test: poc in bug
Test: atest Mpeg4H263DecoderTest -- \
      --enable-module-dynamic-download=true
Test: atest android.mediav2.cts
Test: atest android.media.cts

Merged-In: I76312e46dbf26d666b634f67ba840b01603ca8e5
Change-Id: Ic906ea4833eab1d8a31767f963389b84fe23a006