arm64: dts: mediatek: mt8183-kukui: Assign sram supply to mfg_async pd

Add a phandle to the MT8183_POWER_DOMAIN_MFG_ASYNC power domain and
assign the GPU VSRAM supply to this in mt8183-kukui: this allows to
keep the sram powered up while the GPU is used.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220623123850.110225-3-angelogioacchino.delregno@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi

@@ -821,6 +821,10 @@ cros_ec {
 	};
 };
 
+&mfg_async {
+	domain-supply = <&mt6358_vsram_gpu_reg>;
+};
+
 &mfg {
 	domain-supply = <&mt6358_vgpu_reg>;
 };

arch/arm64/boot/dts/mediatek/mt8183.dtsi

@@ -788,7 +788,7 @@ power-domain@MT8183_POWER_DOMAIN_CONN {
 					#power-domain-cells = <0>;
 				};
 
-				power-domain@MT8183_POWER_DOMAIN_MFG_ASYNC {
+				mfg_async: power-domain@MT8183_POWER_DOMAIN_MFG_ASYNC {
 					reg = <MT8183_POWER_DOMAIN_MFG_ASYNC>;
 					clocks = <&topckgen CLK_TOP_MUX_MFG>;
 					clock-names = "mfg";