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/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
index b5a98f5..235a5fc 100644
--- a/drivers/mtd/nand/raw/denali.c
+++ b/drivers/mtd/nand/raw/denali.c
@@ -8,8 +8,10 @@
 #include <asm/dma-mapping.h>
 #include <dm.h>
 #include <nand.h>
+#include <dm/devres.h>
 #include <linux/bitfield.h>
 #include <linux/dma-direction.h>
+#include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/io.h>
 #include <linux/mtd/mtd.h>