[S390] pm: fix build error for !SMP

Fix build error for !SMP:

arch/s390/power/built-in.o: In function `swsusp_arch_resume':
(.text+0x1b4): undefined reference to `smp_get_phys_cpu_id'
arch/s390/power/built-in.o: In function `swsusp_arch_resume':
(.text+0x288): undefined reference to `smp_switch_boot_cpu_in_resume'
make: *** [.tmp_vmlinux1] Error 1

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/power/swsusp_asm64.S b/arch/s390/power/swsusp_asm64.S
index 3c74e7d..76d688d 100644
--- a/arch/s390/power/swsusp_asm64.S
+++ b/arch/s390/power/swsusp_asm64.S
@@ -109,10 +109,11 @@
 	aghi	%r15,-STACK_FRAME_OVERHEAD
 	stg	%r1,__SF_BACKCHAIN(%r15)
 
+#ifdef CONFIG_SMP
 	/* Save boot cpu number */
 	brasl	%r14,smp_get_phys_cpu_id
 	lgr	%r10,%r2
-
+#endif
 	/* Deactivate DAT */
 	stnsm	__SF_EMPTY(%r15),0xfb
 
@@ -177,11 +178,12 @@
 	/* Pointer to save arae */
 	lghi	%r13,0x1000
 
+#ifdef CONFIG_SMP
 	/* Switch CPUs */
 	lgr	%r2,%r10		/* get cpu id */
 	llgf	%r3,0x318(%r13)
 	brasl	%r14,smp_switch_boot_cpu_in_resume
-
+#endif
 	/* Restore prefix register */
 	spx	0x318(%r13)