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/tools_common.h b/tools_common.h
index ce4fbf8..4cdb312 100644
--- a/tools_common.h
+++ b/tools_common.h
@@ -13,10 +13,10 @@
 #include <stdio.h>
 
 #include "./vpx_config.h"
-#include "vpx/vpx_codec.h"
-#include "vpx/vpx_image.h"
-#include "vpx/vpx_integer.h"
-#include "vpx_ports/msvc.h"
+#include "aom/vpx_codec.h"
+#include "aom/vpx_image.h"
+#include "aom/vpx_integer.h"
+#include "aom_ports/msvc.h"
 
 #if CONFIG_ENCODERS
 #include "./y4minput.h"