[NTOS:KD64] Some code formatting + add SAL2 annotations to the functions that are going to be involved in the next commit.

+ s/ReturnStatus/Status/ , and get rid of Win32 LPSTR and replace by
  PCHAR (since the concerned code deals with counted strings).

sdk/include/ndk/kdfuncs.h

@@ -33,13 +33,13 @@ Author:
 NTSTATUS
 NTAPI
 KdSystemDebugControl(
-    SYSDBG_COMMAND Command,
-    PVOID InputBuffer,
-    ULONG InputBufferLength,
-    PVOID OutputBuffer,
-    ULONG OutputBufferLength,
-    PULONG ReturnLength,
-    KPROCESSOR_MODE PreviousMode
+    _In_ SYSDBG_COMMAND Command,
+    _In_ PVOID InputBuffer,
+    _In_ ULONG InputBufferLength,
+    _Out_ PVOID OutputBuffer,
+    _In_ ULONG OutputBufferLength,
+    _Inout_ PULONG ReturnLength,
+    _In_ KPROCESSOR_MODE PreviousMode
 );
 
 BOOLEAN