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/misc/microchip_flexcom.c b/drivers/misc/microchip_flexcom.c
index 1bc19ed..4cff160 100644
--- a/drivers/misc/microchip_flexcom.c
+++ b/drivers/misc/microchip_flexcom.c
@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <misc.h>
 #include <asm/io.h>
+#include <linux/err.h>
 
 struct microchip_flexcom_regs {
 	u32 cr;
diff --git a/drivers/misc/tegra186_bpmp.c b/drivers/misc/tegra186_bpmp.c
index 89e27dd..489337c 100644
--- a/drivers/misc/tegra186_bpmp.c
+++ b/drivers/misc/tegra186_bpmp.c
@@ -12,6 +12,7 @@
 #include <misc.h>
 #include <asm/arch-tegra/bpmp_abi.h>
 #include <asm/arch-tegra/ivc.h>
+#include <linux/err.h>
 
 #define BPMP_IVC_FRAME_COUNT 1
 #define BPMP_IVC_FRAME_SIZE 128