Correcting NumCoeff Check in VLD

The coefficient index should be less than the number of coefficients
allowed (max = 64). The check has been moved, so we check only before
reading a new coefficient.

Bug: 37237390
Bug: 37203196
Test: ran POC on patched n-mr2 system
Change-Id: I61060c524a5c3c26c7d1fe901393df083b2372ea
(cherry picked from commit edfd6f6089d54c9bdf937b614724cb02179ed178)