cpu/x86/lapic: Move LAPIC configuration to MP init

Implementation for setup_lapic() did two things -- call
enable_lapic() and virtual_wire_mode_init().

In PARALLEL_MP case enable_lapic() was redundant as it
was already executed prior to initialize_cpu() call.
For the !PARALLEL_MP case enable_lapic() is added to
AP CPUs.

Change-Id: I5caf94315776a499e9cf8f007251b61f51292dc5
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58387
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/include/cpu/x86/lapic.h

@@ -177,6 +177,6 @@ void stop_this_cpu(void);
 
 void enable_lapic(void);
 void disable_lapic(void);
-void setup_lapic(void);
+void setup_lapic_interrupts(void);
 
 #endif /* CPU_X86_LAPIC_H */