arm64: dts: mediatek: mt7988a-bpi-r4: add proc-supply for cci

CCI requires proc-supply. Add it on board level.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250706132213.20412-12-linux@fw-web.de
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Author: frank-w

arch/arm64/boot/dts/mediatek/mt7988a-bananapi-bpi-r4.dtsi

@@ -40,6 +40,10 @@
 	};
 };
 
+&cci {
+	proc-supply = <&rt5190_buck3>;
+};
+
 &cpu0 {
 	proc-supply = <&rt5190_buck3>;
 };