[NTOS:KE] Fix some locking issues

ntoskrnl/include/internal/ke_x.h

···
 // This routine must be entered with the PRCB lock held and it will exit
 // with the PRCB lock released!
 //
+_Requires_lock_held_(Prcb->PrcbLock)
+_Releases_lock_(Prcb->PrcbLock)
 FORCEINLINE
 VOID
 KxQueueReadyThread(IN PKTHREAD Thread,

ntoskrnl/ke/amd64/stubs.c

···
 KiConvertToGuiThread(
     VOID);
 
+_Requires_lock_not_held_(Prcb->PrcbLock)
 VOID
 NTAPI
 KiDpcInterruptHandler(VOID)
···
     }
     else if (Prcb->NextThread)
     {
+        /* Acquire the PRCB lock */
+        KiAcquirePrcbLock(Prcb);
+
         /* Capture current thread data */
         OldThread = Prcb->CurrentThread;
         NewThread = Prcb->NextThread;

ntoskrnl/ke/dpc.c

···
     }
 }
 
+_Requires_lock_not_held_(Prcb->PrcbLock)
 VOID
 NTAPI
 KiQuantumEnd(VOID)

ntoskrnl/ke/procobj.c

···
     /* Lock the process */
     KiAcquireProcessLockRaiseToSynch(Process, &ProcessLock);
 
+    /* Acquire the dispatcher lock */
+    KiAcquireDispatcherLockAtSynchLevel();
+
     /* Check if we are modifying the quantum too */
     if (Quantum) Process->QuantumReset = Quantum;