ARM: imx6: build headsmp.o only on CONFIG_SMP

With v7_cpu_resume() being moved out of headsmp.S, all the remaining
code in the file is only needed by CONFIG_SMP build.  So we can control
the build of headsmp.o with only obj-$(CONFIG_SMP) now.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/Makefile

@@ -104,9 +104,9 @@ obj-$(CONFIG_SOC_IMX6SL) += clk-imx6sl.o mach-imx6sl.o
 
 AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
 obj-$(CONFIG_SUSPEND) += suspend-imx6.o
-obj-$(CONFIG_SOC_IMX6Q) += pm-imx6q.o headsmp.o
+obj-$(CONFIG_SOC_IMX6Q) += pm-imx6q.o
 # i.MX6SL reuses i.MX6Q code
-obj-$(CONFIG_SOC_IMX6SL) += pm-imx6q.o headsmp.o
+obj-$(CONFIG_SOC_IMX6SL) += pm-imx6q.o
 
 # i.MX5 based machines
 obj-$(CONFIG_MACH_MX51_BABBAGE) += mach-mx51_babbage.o

arch/arm/mach-imx/headsmp.S

@@ -15,7 +15,6 @@
 
 	.section ".text.head", "ax"
 
-#ifdef CONFIG_SMP
 diag_reg_offset:
 	.word	g_diag_reg - .
 
@@ -32,4 +31,3 @@ ENTRY(v7_secondary_startup)
 	set_diag_reg
 	b	secondary_startup
 ENDPROC(v7_secondary_startup)
-#endif