'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>

Current DT binding documentation shows an example where the IRQ
for the device is chosen to be ACTIVE_HIGH. This is incorrect as
the device only supports ACTIVE_LOW, so this commit fixes that
discrepancy.
Signed-off-by: NAdam Thomson <Adam.Thomson.Opensource@diasemi.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

Signed-off-by: NAdam Thomson <Adam.Thomson.Opensource@diasemi.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>