fusee_cpp: implement cpu startup

libraries/libexosphere/include/exosphere/clkrst.hpp

@@ -31,6 +31,7 @@ namespace ams::clkrst {
 
     void EnableSeClock();
     void EnableCldvfsClock();
+    void EnableCsiteClock();
     void EnableTzramClock();
 
     void EnableCache2Clock();

libraries/libexosphere/include/exosphere/hw/hw_arm64_cache.hpp

@@ -53,5 +53,6 @@ namespace ams::hw::arch::arm64 {
     }
 
     void FlushDataCache(const void *ptr, size_t size);
+    void InvalidateDataCache(const void *ptr, size_t size);
 
 }