ARM: tegra: Specify CPU suspend OPP in device-tree

Specify CPU suspend OPP in a device-tree, just for consistency. Now CPU
will always suspend on the same frequency.

Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30
Tested-by: Nicolas Chauvet <kwizart@gmail.com> # PAZ00 T20
Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30
Tested-by: Dmitry Osipenko <digetx@gmail.com> # A500 T20 and Nexus7 T30
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20-cpu-opp.dtsi

@@ -9,12 +9,14 @@ opp@216000000,750 {
 			clock-latency-ns = <400000>;
 			opp-supported-hw = <0x0F 0x0003>;
 			opp-hz = /bits/ 64 <216000000>;
+			opp-suspend;
 		};
 
 		opp@216000000,800 {
 			clock-latency-ns = <400000>;
 			opp-supported-hw = <0x0F 0x0004>;
 			opp-hz = /bits/ 64 <216000000>;
+			opp-suspend;
 		};
 
 		opp@312000000,750 {

arch/arm/boot/dts/tegra30-cpu-opp.dtsi

@@ -45,18 +45,21 @@ opp@204000000,800 {
 			clock-latency-ns = <100000>;
 			opp-supported-hw = <0x1F 0x31FE>;
 			opp-hz = /bits/ 64 <204000000>;
+			opp-suspend;
 		};
 
 		opp@204000000,850 {
 			clock-latency-ns = <100000>;
 			opp-supported-hw = <0x1F 0x0C01>;
 			opp-hz = /bits/ 64 <204000000>;
+			opp-suspend;
 		};
 
 		opp@204000000,912 {
 			clock-latency-ns = <100000>;
 			opp-supported-hw = <0x1F 0x0200>;
 			opp-hz = /bits/ 64 <204000000>;
+			opp-suspend;
 		};
 
 		opp@312000000,850 {