arm64: dts: mediatek: mt8173: Drop VDEC_SYS reg from decoder

Remove the VDEC_SYS register space from the decoder, so that the node
address becomes that of VDEC_MISC, solving the long-standing conflicting
addresses between this node and the vdecsys clock-controller node:

arch/arm64/boot/dts/mediatek/mt8173.dtsi:1365.38-1369.5: Warning (unique_unit_address_if_enabled): /soc/clock-controller@16000000: duplicate unit-address (also used in node /soc/vcodec@16000000)

The driver makes use of this register space, however, so also add a
phandle to the VDEC_SYS syscon to maintain functionality.
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230630151436.155586-7-nfraprado@collabora.com

arch/arm64/boot/dts/mediatek/mt8173.dtsi

@@ -1368,10 +1368,9 @@ vdecsys: clock-controller@16000000 {
 			#clock-cells = <1>;
 		};
 
-		vcodec_dec: vcodec@16000000 {
+		vcodec_dec: vcodec@16020000 {
 			compatible = "mediatek,mt8173-vcodec-dec";
-			reg = <0 0x16000000 0 0x100>,	/* VDEC_SYS */
-			      <0 0x16020000 0 0x1000>,	/* VDEC_MISC */
+			reg = <0 0x16020000 0 0x1000>,	/* VDEC_MISC */
 			      <0 0x16021000 0 0x800>,	/* VDEC_LD */
 			      <0 0x16021800 0 0x800>,	/* VDEC_TOP */
 			      <0 0x16022000 0 0x1000>,	/* VDEC_CM */
@@ -1382,6 +1381,8 @@ vcodec_dec: vcodec@16000000 {
 			      <0 0x16027000 0 0x800>,	/* VDEC_HWQ */
 			      <0 0x16027800 0 0x800>,	/* VDEC_HWB */
 			      <0 0x16028400 0 0x400>;	/* VDEC_HWG */
+			reg-names = "misc", "ld", "top", "cm", "ad", "av", "pp",
+				    "hwd", "hwq", "hwb", "hwg";
 			interrupts = <GIC_SPI 204 IRQ_TYPE_LEVEL_LOW>;
 			iommus = <&iommu M4U_PORT_HW_VDEC_MC_EXT>,
 				 <&iommu M4U_PORT_HW_VDEC_PP_EXT>,
@@ -1392,6 +1393,7 @@ vcodec_dec: vcodec@16000000 {
 				 <&iommu M4U_PORT_HW_VDEC_VLD_EXT>,
 				 <&iommu M4U_PORT_HW_VDEC_VLD2_EXT>;
 			mediatek,vpu = <&vpu>;
+			mediatek,vdecsys = <&vdecsys>;
 			power-domains = <&spm MT8173_POWER_DOMAIN_VDEC>;
 			clocks = <&apmixedsys CLK_APMIXED_VCODECPLL>,
 				 <&topckgen CLK_TOP_UNIVPLL_D2>,