dm: core: Require users of devres to include the header

At present devres.h is included in all files that include dm.h but few
make use of it. Also this pulls in linux/compat which adds several more
headers. Drop the automatic inclusion and require files to include devres
themselves. This provides a good indication of which files use devres.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Anatolij Gustschin <agust@denx.de>

drivers/usb/cdns3/core.c

@@ -14,6 +14,7 @@
 #include <common.h>
 #include <dm.h>
 #include <dm/device-internal.h>
+#include <dm/devres.h>
 #include <dm/lists.h>
 #include <linux/kernel.h>
 #include <linux/io.h>

drivers/usb/cdns3/gadget.c

@@ -57,6 +57,8 @@
  */
 
 #include <dm.h>
+#include <dm/devres.h>
+#include <linux/err.h>
 #include <linux/usb/gadget.h>
 #include <linux/compat.h>
 #include <linux/iopoll.h>

drivers/usb/cdns3/host.c

@@ -9,6 +9,7 @@
  *          Pawel Laszczak <pawell@cadence.com>
  */
 #include <dm.h>
+#include <dm/devres.h>
 #include <linux/compat.h>
 #include <usb.h>
 #include <usb/xhci.h>