add customer build kernel module for android

 BOARD_VENDOR_KERNEL_MODULES += $(KERNEL_MODULES_OUT)/ifxahd.ko

cat << EOF > Android.mk

DLKM_DIR   :=  $(TOP)/device/qcom/common/dlkm

LOCAL_PATH := $(call my-dir)

LOCAL_REQUIRED_MODULES := sec-module-symvers

LOCAL_ADDITIONAL_DEPENDENCIES += $(call intermediates-dir-for,DLKM,sec-module-symvers)/Module.symvers

KBUILD_OPTIONS += KBUILD_EXTRA_SYMBOLS=$(PWD)/$(call intermediates-dir-for,DLKM,sec-module-symvers)/Module.symvers

include $(CLEAR_VARS)

LOCAL_MODULE              := ifxahd.ko

LOCAL_MODULE_KBUILD_NAME  := bcmdhd.ko

LOCAL_MODULE_TAGS         := optional

LOCAL_MODULE_DEBUG_ENABLE := true

LOCAL_MODULE_PATH         := $(KERNEL_MODULES_OUT)

LOCAL_SRC_FILES           := $(wildcard $(LOCAL_PATH)/**/*) $(wildcard $(LOCAL_PATH)/*)

include $(DLKM_DIR)/Build_external_kernelmodule.mk

EOF

cat << EOF > Makefile

KDIR=$(KERNEL_SRC)

all:

        @echo "$(MAKE) --no-print-directory -C $(KDIR) M=$(M) modules"

        @$(MAKE) --no-print-directory -C $(KDIR) M=$(M) modules

clean:

        rm -rf *.o *.ko *.mod.c *~ .*.cmd *.o.cmd .*.o.cmd .*.o.d *.mod \

        Module.symvers modules.order .tmp_versions modules.builtin

install:

        @$(MAKE) --no-print-directory -C $(KDIR) \

                SUBDIRS=$(CURDIR) INSTALL_MOD_STRIP=1 modules_install

EOF