arm64: dts: mt8173: Add capacity-dmips-mhz attributes

Dhrystone benchmark on Acer Chromebook R13 CB5-312T:
A72: 15698587 dps @ 1807 MHz
A53:  7598784 dps @ 1703 MHz
Signed-off-by: Ulrich Hecht <uli-qwV78thtvt0@public.gmane.org>
Link: https://lore.kernel.org/r/1563529816-3992-1-git-send-email-uli@fpond.euSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

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

@@ -167,6 +167,7 @@ cpu0: cpu@0 {
 				 <&apmixedsys CLK_APMIXED_MAINPLL>;
 			clock-names = "cpu", "intermediate";
 			operating-points-v2 = <&cluster0_opp>;
+			capacity-dmips-mhz = <526>;
 		};
 
 		cpu1: cpu@1 {
@@ -181,6 +182,7 @@ cpu1: cpu@1 {
 				 <&apmixedsys CLK_APMIXED_MAINPLL>;
 			clock-names = "cpu", "intermediate";
 			operating-points-v2 = <&cluster0_opp>;
+			capacity-dmips-mhz = <526>;
 		};
 
 		cpu2: cpu@100 {
@@ -195,6 +197,7 @@ cpu2: cpu@100 {
 				 <&apmixedsys CLK_APMIXED_MAINPLL>;
 			clock-names = "cpu", "intermediate";
 			operating-points-v2 = <&cluster1_opp>;
+			capacity-dmips-mhz = <1024>;
 		};
 
 		cpu3: cpu@101 {
@@ -209,6 +212,7 @@ cpu3: cpu@101 {
 				 <&apmixedsys CLK_APMIXED_MAINPLL>;
 			clock-names = "cpu", "intermediate";
 			operating-points-v2 = <&cluster1_opp>;
+			capacity-dmips-mhz = <1024>;
 		};
 
 		idle-states {