dm: core: Allow a list of devices to be declared in one step

The U_BOOT_DEVICE macro allows the declaration of a single U-Boot device.
Add an equivalent macro to declare an array of devices, for convenience.

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

include/dm/platdata.h

@@ -27,4 +27,8 @@ struct driver_info {
 #define U_BOOT_DEVICE(__name)						\
 	ll_entry_declare(struct driver_info, __name, driver_info)
 
+/* Declare a list of devices. The argument is a driver_info[] array */
+#define U_BOOT_DEVICES(__name)						\
+	ll_entry_declare_list(struct driver_info, __name, driver_info)
+
 #endif