[Ozone] Rename and split the DRI platform for clarity

This CL does the following:
 - Moves the files in ui/ozone/platform/dri to ui/ozone/platform/drm
   since the platform name should really be DRM rather than DRI. Note,
   that the platform is still refered to as "dri" in GYP/GN since CrOS
   builds are still using the 'dri' name.
 - Rename all files with a "_dri*" suffix to a "drm_" prefix. Also
   rename all files with a "dri_" prefix to a "drm_" prefix.
 - Rename NativeDisplayDelegateDri to DrmDisplayDelegateManager since it
   is no longer dependent on the NativeDisplayDelegate interface and the
   new name better describes its intent.
 - Split the files in the platform into 2 sub-folders ("host" and
   "gpu"). Depending on the intended use place of the objects (Browser
   (host) process or GPU process) the files in the platform are split
   accordingly in the 2 sub-folders.

BUG=none
[email protected]

Review URL: https://codereview.chromium.org/975063002

Cr-Commit-Position: refs/heads/master@{#319320}
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index a57a2c0..8bfd5cf 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -174,7 +174,8 @@
             r"simple_platform_shared_buffer_posix\.cc$",
         r"^net[\\\/]disk_cache[\\\/]cache_util\.cc$",
         r"^net[\\\/]url_request[\\\/]test_url_fetcher_factory\.cc$",
-        r"^ui[\\\/]ozone[\\\/]platform[\\\/]dri[\\\/]native_display_delegate_proxy\.cc$",
+        r"^ui[\\\/]ozone[\\\/]platform[\\\/]drm[\\\/]host[\\\/]"
+            "drm_native_display_delegate\.cc$",
       ),
     ),
     (