ARM: OMAP2+: Only manually add hwmod data when DT not used.

The omap_init_rng() routine in devices.c only needs to be
called when there is no device tree present.

Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>