rust: bindings: Add <linux/of_dma.h>

AOP audio uses `of_dma_request_slave_channel()`.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

rust/bindings/bindings_helper.h

@@ -29,6 +29,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/of_dma.h>
 #include <linux/pci.h>
 #include <linux/phy.h>
 #include <linux/pid_namespace.h>