Implement the fixed-point LFE x96 interpolation filter in AArch64 NEON.
Query with the flags the images are actually created with.
top-back channels are currently left unaccounted and can be dropped during downmixing. when the output retains top-front channels, follow IAMF 1.1.0 and fold top-back into top-front at 0.707.
Mantissas are the last data in the channel subsegment and it appears it is sometimes missing a very few bits for the parsing to complete.
Same as with APV, and FFv1.