'interrupt-parent' is often documented as part of define bindings, but
it is really outside the scope of a device binding. It's never required
in a given node as it is often inherited from a parent node. Or it can
be implicit if a parent node is an 'interrupt-controller' node. So
remove it from all the binding files.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: NRob Herring <robh@kernel.org>

Add the TI afe4404 heart monitor DT bindings documentation.
Create health directory created under iio.
Signed-off-by: NAndrew F. Davis <afd@ti.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>