Revert "Revert "Turn CONFIG_AMVR on by default""

This reverts commit e0a9f7246fe86819cac1dc180aa36801c9b7f8dd.

Reason for revert: The crash issue has been fixed.

Change-Id: I23196f562c57d412db4dca06ec86d2ee29f9bd91

build/cmake/aom_config_defaults.cmake

diff --git a/build/cmake/aom_config_defaults.cmake b/build/cmake/aom_config_defaults.cmake
index e80693b..33ed761 100644
--- a/build/cmake/aom_config_defaults.cmake
+++ b/build/cmake/aom_config_defaults.cmake
@@ -88,7 +88,7 @@
 set(CONFIG_SPATIAL_RESAMPLING 1 CACHE NUMBER "Spatial resampling.")
 
 # AV1 experiment flags.
-set(CONFIG_AMVR 0 CACHE NUMBER "AV1 experiment flag.")
+set(CONFIG_AMVR 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_AOM_QM_EXT 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_CDF_UPDATE_MODE 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_CFL 1 CACHE NUMBER "AV1 experiment flag.")