clk: renesas: r8a779h0: Add display clocks

clk: renesas: r8a779h0: Add display clocks

Add display related clocks for DU, DSI, FCPVD, and VSPD.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20241206-rcar-gh-dsi-v3-5-d74c2166fa15@ideasonboard.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>