mlxsw: reg: Add Policy-Engine Rules Copy Register

The PRCR register is used for accessing rules within a TCAM region.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>