arm64: dts: renesas: r9a08g045: Add missing cache-level for L3 cache

arm64: dts: renesas: r9a08g045: Add missing cache-level for L3 cache

Fix the following DTBS check warnings:

    arch/arm64/boot/dts/renesas/r9a08g045s33-smarc.dtb: cache-controller-0: 'cache-level' is a required property
	    from schema $id: http://devicetree.org/schemas/cache.yaml#
    arch/arm64/boot/dts/renesas/r9a08g045s33-smarc.dtb: cache-controller-0: 'cache-level' is a required property
	    from schema $id: http://devicetree.org/schemas/cache.yaml#
    arch/arm64/boot/dts/renesas/r9a08g045s33-smarc.dtb: cache-controller-0: Unevaluated properties are not allowed ('cache-size', 'cache-unified' were unexpected)
	    from schema $id: http://devicetree.org/schemas/cache.yaml#

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231010132701.1658737-7-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>