[HAL] Fix SMP initialization

- Don't use CONFIG_SMP, this isn't handled in (most of) hal
- Add a dummy HalpSetupProcessorsTable for UP
- Call HalpRegisterKdSupportFunctions only for processor 0

hal/halx86/apic/halinit.c

@@ -25,16 +25,12 @@ HalpInitProcessor(
     IN ULONG ProcessorNumber,
     IN PLOADER_PARAMETER_BLOCK LoaderBlock)
 {
-#ifdef CONFIG_SMP
     if (ProcessorNumber == 0)
     {
-#endif
         HalpParseApicTables(LoaderBlock);
-#ifdef CONFIG_SMP
     }
 
     HalpSetupProcessorsTable(ProcessorNumber);
-#endif
 
     /* Initialize the local APIC for this cpu */
     ApicInitializeLocalApic(ProcessorNumber);

hal/halx86/generic/halinit.c

@@ -57,9 +57,12 @@ HalInitializeProcessor(
     InterlockedBitTestAndSetAffinity(&HalpActiveProcessors, ProcessorNumber);
     InterlockedBitTestAndSetAffinity(&HalpDefaultInterruptAffinity, ProcessorNumber);
 
+    if (ProcessorNumber == 0)
+    {
         /* Register routines for KDCOM */
         HalpRegisterKdSupportFunctions();
     }
+}
 
 /*
  * @implemented

hal/halx86/generic/up.c

@@ -33,6 +33,13 @@ HalStartNextProcessor(
     return FALSE;
 }
 
+VOID
+HalpSetupProcessorsTable(
+    _In_ UINT32 NTProcessorNumber)
+{
+    NOTHING;
+}
+
 #ifdef _M_AMD64
 
 VOID