OMAP4: hwmod: add sl2if module

Add sl2if module to hwmod framework.

Signed-off-by: Miguel Vadillo <vadillo@ti.com>
Signed-off-by: Fernando Guzman Lugo <fernando.lugo@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Acked-by: Rajendra Nayak <rnayak@ti.com>