media: chips-media: wave5: separate irq setup routine

Implement a separate setup routine for interrupts to reduce code
duplication. Also enable interrupts based on vpu_attr->support_encoders
and vpu_attr->support_decoders fields to facilitate support for other
Wave5xx IPs, because not all of them are both encoders and decoders.

Signed-off-by: Ivan Bornyakov <brnkv.i1@gmail.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>