Enable global_motion experiment by default

Change-Id: I698fc004140d43db959825dd923fad610f78b345
diff --git a/configure b/configure
index fc844b2..817085d 100755
--- a/configure
+++ b/configure
@@ -484,6 +484,7 @@
     soft_enable delta_q
     soft_enable tile_groups
     soft_enable rect_tx
+    soft_enable global_motion
     soft_enable cdef
     soft_enable ec_adapt
     soft_enable new_tokenset