arm: ls102xa: clear EPU registers for deep sleep

After wakeup from deep sleep, Clear EPU registers as early as possible
to prevent from possible issue. It's also safe to clear at normal boot.

Signed-off-by: Chenhui Zhao <chenhui.zhao@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/arch/arm/cpu/armv7/ls102xa/Makefile b/arch/arm/cpu/armv7/ls102xa/Makefile
index d82ce8d..ae4f25d 100644
--- a/arch/arm/cpu/armv7/ls102xa/Makefile
+++ b/arch/arm/cpu/armv7/ls102xa/Makefile
@@ -7,6 +7,7 @@
 obj-y	+= cpu.o
 obj-y	+= clock.o
 obj-y	+= timer.o
+obj-y	+= fsl_epu.o
 
 obj-$(CONFIG_OF_LIBFDT) += fdt.o
 obj-$(CONFIG_SYS_HAS_SERDES) += fsl_ls1_serdes.o ls102xa_serdes.o