Revert "Turn CONFIG_AMVR on by default"
Revert "Turn CONFIG_AMVR on by default"

This reverts commit 083be6aab77041b96391c7a1a021a6b6fd946d98.

Reason for revert: AMVR causes a segmentation fault when encoding

BUG=aomedia:1466

Change-Id: I6c835629a17bfbebe34caaad40a2524689246cdb

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom