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/tee/optee/core.c b/drivers/tee/optee/core.c
index 7f870f2..a7b175e 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -8,6 +8,7 @@
 #include <log.h>
 #include <tee.h>
 #include <linux/arm-smccc.h>
+#include <linux/err.h>
 #include <linux/io.h>
 
 #include "optee_smc.h"