shill: wimax: Move wimax code to its own sub-directory.

This CL is part of a series of CLs, which aim to reorganzie shill's flat
source code structure into a more modular form by moving technology
specific code into their own sub-directories.

BUG=chromium:433419
TEST=`USE='wimax' FEATURES=test emerge-$BOARD shill`
TEST=`USE='wimax clang asan' FEATURES=test emerge-$BOARD shill`

Change-Id: I6b2be3550026cb2e176c0107d10da1e29d2606b0
Reviewed-on: https://chromium-review.googlesource.com/229798
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
diff --git a/manager.h b/manager.h
index 3ef6feb..d0ddd65 100644
--- a/manager.h
+++ b/manager.h
@@ -31,7 +31,7 @@
 #include "shill/property_store.h"
 #include "shill/service.h"
 #include "shill/wifi.h"
-#include "shill/wimax_provider.h"
+#include "shill/wimax/wimax_provider.h"
 
 namespace shill {