char: hwrng: Add Axxia HW Random number generator

commit  9507e22a45a5549078062b47efa33ed1a4fda070 from
https://github.com/axxia/linux-yocto.git

 axxia-linux/v5.10/standard/axxia-dev/base

AXXIA TRNG block driver for random number generation has been added.
This provides HW Random number generation using AXXIA HW block. When
enabled in the device tree, /dev/hwrng device is available and random
numbers can be read from there.

Signed-off-by: John Jacques <john.jacques@intel.com>
Signed-off-by: Sreedevi Joshi <sreedevi.joshi@intel.com>
Signed-off-by: Marek Majtyka <marekx.majtyka@intel.com>
Signed-off-by: Charlie Paul <charlie.paul@windriver.com>
Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>