[msm7627]: Replace thread_sleep calls and disable keypad initialization for nandwrite

Disable keypad initialization for nandwrite. Replace thread_sleep calls with
mdelay.
diff --git a/target/msm7627_surf/init.c b/target/msm7627_surf/init.c
index ef043c1..8a57d56 100644
--- a/target/msm7627_surf/init.c
+++ b/target/msm7627_surf/init.c
@@ -87,8 +87,10 @@
 
 	dprintf(INFO, "target_init()\n");
 
+#if (!ENABLE_NANDWRITE)
 	keys_init();
 	keypad_init();
+#endif
 
 	if (target_is_emmc_boot())
 		return;