Add debug screen clear at end of kernel initialization

xtoskrnl/ke/amd64/krnlinit.c

@@ -109,6 +109,7 @@ KepStartKernel(VOID)
     CurrentProcess->ActiveProcessors |= (ULONG_PTR)1 << Prcb->CpuNumber;
 
     /* Enter infinite loop */
+    HlClearScreen(0x7F7F7FFF);
     DebugPrint(L"KepStartKernel() finished. Entering infinite loop.\n");
     for(;;);
 }

xtoskrnl/ke/i686/krnlinit.c

@@ -109,6 +109,7 @@ KepStartKernel(VOID)
     CurrentProcess->ActiveProcessors |= (ULONG_PTR)1 << Prcb->CpuNumber;
 
     /* Enter infinite loop */
+    HlClearScreen(0x7F7F7FFF);
     DebugPrint(L"KepStartKernel() finished. Entering infinite loop.\n");
     for(;;);
 }