arm64: dts: renesas: r8a7795: remove unneeded sound #address/size-cells

commit 2d87dc0e ("arm64: dts: renesas: r8a7795: Add address
properties to rcar_sound port nodes") added missing #address-cells
and #size-cells for sound ports.
But, these are based on platform, not on SoC. This patch cleanups it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>