hwrng: omap - Enable driver for TI K3 family

The TI K3 family of SoCs have a SA2UL IP that contains a
SafeXcel IP-76 RNG block which is supported by the OMAP
RNG driver. Allow this driver to be built for TI K3
family as well.

Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>