package/on2-8170-modules: use kernel-module helper

We were already using the Linux buildsystem to build on2-8170-modules,
so just switch to the new kernel-module infra.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/on2-8170-modules/on2-8170-modules.mk

@@ -7,17 +7,8 @@
 ON2_8170_MODULES_VERSION = 73b08061d30789178e692bc332b73d1d9922bf39
 ON2_8170_MODULES_SITE = $(call github,alexandrebelloni,on2-8170-modules,$(ON2_8170_MODULES_VERSION))
 
-ON2_8170_MODULES_DEPENDENCIES = linux
-
 ON2_8170_MODULES_LICENSE = GPLv2+
 #There is no license file
 
-define ON2_8170_MODULES_BUILD_CMDS
-	$(MAKE) -C $(LINUX_DIR) $(LINUX_MAKE_FLAGS) M=$(@D)
-endef
-
-define ON2_8170_MODULES_INSTALL_TARGET_CMDS
-	$(MAKE) -C $(LINUX_DIR) $(LINUX_MAKE_FLAGS) M=$(@D) modules_install
-endef
-
+$(eval $(kernel-module))
 $(eval $(generic-package))