Remove codec aggregation/summarization

The aggregation, which tries to collect info for standard deviation,
used a 64-bit counter. But with a 4GB video file, when you square the
bytecount, you quickly run up against the 64 bit limit.
So we won't be aggregating those records any longer on-device.

Bug: 66226775
Test: dumpsys media.metrics -summary, no aggregated codec lines
Change-Id: I7c8347eba3d48dfd3b26916e9eb76de1c129817f