Remove static def in pickcdef.c

Avoid tasn error in multi-threading setting.

BUG=b/147524418

Change-Id: I415ec02b01eec3fddad3c08951d46740e36e1072
diff --git a/av1/encoder/pickcdef.c b/av1/encoder/pickcdef.c
index d3ae348..5f195c6 100644
--- a/av1/encoder/pickcdef.c
+++ b/av1/encoder/pickcdef.c
@@ -364,7 +364,7 @@
 
   uint16_t *src[3];
   uint16_t *ref_coeff[3];
-  static cdef_list dlist[MI_SIZE_128X128 * MI_SIZE_128X128];
+  cdef_list dlist[MI_SIZE_128X128 * MI_SIZE_128X128];
   int dir[CDEF_NBLOCKS][CDEF_NBLOCKS] = { { 0 } };
   int var[CDEF_NBLOCKS][CDEF_NBLOCKS] = { { 0 } };
   const int nvfb = (cm->mi_rows + MI_SIZE_64X64 - 1) / MI_SIZE_64X64;