GameDB: Add eeCycleRate option

For those pesky games with cache/DMA issues only!

pcsx2/Config.h

@@ -175,6 +175,7 @@ enum class SpeedHack
 	MVUFlag,
 	InstantVU1,
 	MTVU,
+	EECycleRate,
 	MaxCount,
 };
 

pcsx2/Docs/gamedb-schema.json

@@ -317,6 +317,11 @@
               "type": "integer",
               "minimum": 0,
               "maximum": 1
+            },
+            "eeCycleRate": {
+              "type": "integer",
+              "minimum": -3,
+              "maximum": 3
             }
           },
           "additionalProperties": false

pcsx2/Pcsx2Config.cpp

@@ -181,6 +181,7 @@ static constexpr const char* s_speed_hack_names[] = {
 	"mvuFlag",
 	"instantVU1",
 	"mtvu",
+	"eeCycleRate",
 };
 
 const char* Pcsx2Config::SpeedhackOptions::GetSpeedHackName(SpeedHack id)
@@ -215,6 +216,9 @@ void Pcsx2Config::SpeedhackOptions::Set(SpeedHack id, int value)
 		case SpeedHack::MTVU:
 			vuThread = (value != 0);
 			break;
+		case SpeedHack::EECycleRate:
+			EECycleRate = static_cast<int>(std::clamp<int>(value, MIN_EE_CYCLE_RATE, MAX_EE_CYCLE_RATE));
+			break;
 			jNO_DEFAULT
 	}
 }