Disable legacy 8259 PIC before enabling APIC

Reviewed-on: xt-sys/exectos#5
Reviewed-by: Rafal Kupiec <belliash@noreply.codingworkshop.git>
Co-authored-by: Jozef Nagy <schkwve@gmail.com>
Co-committed-by: Jozef Nagy <schkwve@gmail.com>

xtoskrnl/ke/amd64/krnlinit.c

@@ -69,6 +69,9 @@ KepInitializeMachine(VOID)
     /* Re-enable IDE interrupts */
     HlIoPortOutByte(0x376, 0);
     HlIoPortOutByte(0x3F6, 0);
+
+    /* Disable the legacy PIC */
+    HlDisablePic();
 }
 
 /**

xtoskrnl/ke/i686/krnlinit.c

@@ -69,6 +69,9 @@ KepInitializeMachine(VOID)
     /* Re-enable IDE interrupts */
     HlIoPortOutByte(0x376, 0);
     HlIoPortOutByte(0x3F6, 0);
+
+	/* Disable the legacy PIC */
+    HlDisablePic();
 }
 
 /**