Call driver setup function in protected entry

The driver manager's function for initializing all builtin drivers is
now being called in the 'stage2_protected_entry'-function, a function
that is called once the GDT is set up and calls all other functions
to get the system to boot.

i386/legacy-boot/src-asm/entry.asm

@@ -54,6 +54,12 @@ stage_2_setup_entry:
 bits 32
 stage2_protected_entry:
 
+    push ebp
+    mov ebp, esp
+    call setup_drivers
+    mov esp, ebp
+    pop ebp
+    
     cli
     hlt