secondary.S: Fix dropping ramstage.a

This unused code was not silently dropped as before.

Change-Id: Ic76c58e233869a60c3a8a27c2efc2182b3a4442d
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1863
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/cpu/x86/lapic/secondary.S

@@ -1,6 +1,7 @@
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/lapic_def.h>
 
+#if CONFIG_SMP && CONFIG_MAX_CPUS > 1
 	.text
 	.globl _secondary_start, _secondary_start_end
 	.balign 4096
@@ -62,3 +63,4 @@ __ap_protected_start:
 	jmp	1b
 
 .code32
+#endif