target: msm8x10: Add target ununit function

Add target ununit function to perform target specific
cleanup before jumping to kernel.

Change-Id: I152142e37590771b0e915534a068d6597b3735f2
diff --git a/target/msm8610/init.c b/target/msm8610/init.c
index 92c9855..3ad6a30 100644
--- a/target/msm8610/init.c
+++ b/target/msm8610/init.c
@@ -165,6 +165,10 @@
 	target_sdc_init();
 }
 
+void target_uninit(void)
+{
+        mmc_put_card_to_sleep(dev);
+}
 /* Do any target specific intialization needed before entering fastboot mode */
 void target_fastboot_init(void)
 {