Disable building OTA package if there is no kernel.

Change-Id: I9a10cba92dd7f9cccd8cca58a5fa2d3a8b4620eb
diff --git a/core/Makefile b/core/Makefile
index d732a61..e6abae7 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1016,6 +1016,7 @@
 ifneq ($(TARGET_SIMULATOR),true)
 ifneq ($(TARGET_PRODUCT),sdk)
 ifneq ($(TARGET_DEVICE),generic)
+ifneq ($(TARGET_NO_KERNEL),true)
 
 name := $(TARGET_PRODUCT)
 ifeq ($(TARGET_BUILD_TYPE),debug)
@@ -1045,6 +1046,7 @@
 .PHONY: otapackage
 otapackage: $(INTERNAL_OTA_PACKAGE_TARGET)
 
+endif    # TARGET_NO_KERNEL != true
 endif    # TARGET_DEVICE != generic
 endif    # TARGET_PRODUCT != sdk
 endif    # TARGET_SIMULATOR != true