dm: core: Create a new header file for 'compat' features

At present dm/device.h includes the linux-compatible features. This
requires including linux/compat.h which in turn includes a lot of headers.
One of these is malloc.h which we thus end up including in every file in
U-Boot. Apart from the inefficiency of this, it is problematic for sandbox
which needs to use the system malloc() in some files.

Move the compatibility features into a separate header file.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/core/devres.c

@@ -10,6 +10,7 @@
 #define LOG_CATEGORY LOGC_DEVRES
 
 #include <common.h>
+#include <malloc.h>
 #include <linux/compat.h>
 #include <linux/kernel.h>
 #include <linux/list.h>

drivers/core/of_access.c

@@ -20,6 +20,7 @@
  */
 
 #include <common.h>
+#include <malloc.h>
 #include <linux/libfdt.h>
 #include <dm/of_access.h>
 #include <linux/ctype.h>

drivers/core/ofnode.c

@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <fdtdec.h>
 #include <fdt_support.h>
+#include <malloc.h>
 #include <linux/libfdt.h>
 #include <dm/of_access.h>
 #include <dm/of_addr.h>

drivers/core/syscon-uclass.c

@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <regmap.h>
 #include <dm/device-internal.h>
+#include <dm/device_compat.h>
 #include <dm/lists.h>
 #include <dm/root.h>
 #include <linux/err.h>