Update the DTS with the proper information required by the
INTC bindings.

- Add the number of interrupt lines
- Add the reg and the compatible entries.
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>
Acked-by: NRob Herring <rob.herring@calxeda.com>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>