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>
diff --git a/cmd/host.c b/cmd/host.c
index 98c4d2a..eefc4f2 100644
--- a/cmd/host.c
+++ b/cmd/host.c
@@ -8,6 +8,7 @@
 #include <fs.h>
 #include <part.h>
 #include <sandboxblockdev.h>
+#include <dm/device_compat.h>
 #include <linux/errno.h>
 
 static int host_curr_device = -1;