ARM: dts: Renesas R9A06G032 SMP enable method

Add a special enable method for the second CA7 of the R9A06G032
as well as the default value for the "cpu-release-addr" property.

Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>