remve prebuilt/elf.3 not used by montblanc-common/custombootimg.mk

in BoardConfig.mk add
TARGET_BOOTANIMATION_NAME := vertical-320x480

in lotus.mk remove
PRODUCT_COPY_FILES += \
        $(LOCAL_PATH)/../../../vendor/cm/prebuilt/common/bootanimation/320.zip:system/media/bootanimation.zip
.