Port folder renaming changes from AOM

Manually cherry-picked commits:
ceef058 libvpx->libaom part2
3d26d91 libvpx -> libaom
cfea7dd vp10/ -> av1/
3a8eff7 Fix a build issue for a test
bf4202e Rename vpx to aom

Change-Id: I1b0eb5a40796e3aaf41c58984b4229a439a597dc
diff --git a/video_reader.c b/video_reader.c
index a0ba252..c3a19d3 100644
--- a/video_reader.c
+++ b/video_reader.c
@@ -14,7 +14,7 @@
 #include "./ivfdec.h"
 #include "./video_reader.h"
 
-#include "vpx_ports/mem_ops.h"
+#include "aom_ports/mem_ops.h"
 
 static const char *const kIVFSignature = "DKIF";