Reverto to use Prebuild Kernel

# Kernel 
# edit to use prebuilt kernel
#ifneq ($(TARGET_PREBUILT_KERNEL),)
#	LOCAL_KERNEL := device/htc/ace/prebuilt/kernel/kernel
ifeq ($(TARGET_PREBUILT_KERNEL),)
	LOCAL_KERNEL := device/htc/ace/prebuilt/kernel/kernel