ARM: dts: k2e: add dts node for k2e hw_rng driver

This patch adds dts node for k2e hw_random generator driver

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>