ARM: davinci: dts: make psc0 a reset provider

The psc driver registers with the reset framework as a provider. Add
the #reset-cells property to the psc0 node.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>