rust: regulator: add regulator consumer abstractions

Add a rust abstraction for the regulator consumer API.

Signed-off-by: Fabien Parent <fabien.parent@linaro.org>

Author: Fabo

rust/bindings/bindings_helper.h

@@ -11,6 +11,7 @@
 #include <linux/errname.h>
 #include <linux/io-pgtable.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/refcount.h>
 #include <linux/wait.h>

rust/kernel/lib.rs

@@ -49,6 +49,8 @@ pub mod of;
 pub mod platform;
 pub mod prelude;
 pub mod print;
+#[cfg(CONFIG_REGULATOR)]
+pub mod regulator;
 mod static_assert;
 #[doc(hidden)]
 pub mod std_vendor;