adb: move fdevent to its own folder.

Preparatory refactoring for platform-specific implementations.

Test: mma
Change-Id: I0f600122ac89241788c5f3300f362fd9ef02ddcd
diff --git a/adb/Android.bp b/adb/Android.bp
index b6aff3e..583248b 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -124,7 +124,7 @@
     "adb_trace.cpp",
     "adb_unique_fd.cpp",
     "adb_utils.cpp",
-    "fdevent.cpp",
+    "fdevent/fdevent.cpp",
     "services.cpp",
     "sockets.cpp",
     "socket_spec.cpp",
@@ -144,7 +144,7 @@
     "adb_io_test.cpp",
     "adb_listeners_test.cpp",
     "adb_utils_test.cpp",
-    "fdevent_test.cpp",
+    "fdevent/fdevent_test.cpp",
     "socket_spec_test.cpp",
     "socket_test.cpp",
     "sysdeps_test.cpp",