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>
diff --git a/cmd/ubi.c b/cmd/ubi.c
index 22ba5b1..7fb4cdf 100644
--- a/cmd/ubi.c
+++ b/cmd/ubi.c
@@ -19,6 +19,7 @@
 #include <mtd.h>
 #include <nand.h>
 #include <onenand_uboot.h>
+#include <dm/devres.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 #include <linux/err.h>