Free two memory leaks in ArmCPUDetect.cpp

Char pointers aren't freed after use.

Fixed this in PPSSPP a few days ago. Forgot to check here for the same thing until now.

Source/Core/Common/Src/ArmCPUDetect.cpp

@@ -68,6 +68,9 @@ unsigned char GetCPUImplementer()
 		sscanf(implementer_string, "0x%02hhx", &implementer);
 		break;
 	}
+
+	free(implementer_string);
+
 	return implementer;
 }
 
@@ -92,6 +95,9 @@ unsigned short GetCPUPart()
 		sscanf(part_string, "0x%03hx", &part);
 		break;
 	}
+
+	free(part_string);
+
 	return part;
 }