package/ktap: use kernel-module helper

Passing the KERNEL_SRC variable is no longer needed, since it was only
used to run commands like:
    $(MAKE) -C $(KERNEL_SRC) M=$(PWD) modules

which is basically what the new kernel-module infra is now doing.

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

package/ktap/ktap.mk

@@ -9,8 +9,6 @@ KTAP_SITE = $(call github,ktap,ktap,$(KTAP_VERSION))
 KTAP_LICENSE = GPLv2
 KTAP_LICENSE_FILES = LICENSE-GPL
 
-KTAP_DEPENDENCIES = linux
-
 ifeq ($(BR2_PACKAGE_ELFUTILS),y)
 KTAP_DEPENDENCIES += elfutils
 else
@@ -19,12 +17,13 @@ endif
 
 define KTAP_BUILD_CMDS
 	$(MAKE) -C $(@D) $(TARGET_CONFIGURE_OPTS) $(KTAP_FLAGS) ktap
-	$(MAKE) -C $(@D) $(LINUX_MAKE_FLAGS) KERNEL_SRC=$(LINUX_DIR) KVERSION=$(LINUX_VERSION_PROBED) mod
 endef
 
 define KTAP_INSTALL_TARGET_CMDS
 	$(INSTALL) -D -m755 $(@D)/ktap  $(TARGET_DIR)/usr/bin/ktap
-	$(MAKE) -C $(@D) $(LINUX_MAKE_FLAGS) KERNEL_SRC=$(LINUX_DIR) KVERSION=$(LINUX_VERSION_PROBED) modules_install
 endef
 
+KTAP_MODULE_MAKE_OPTS = KVERSION=$(LINUX_VERSION_PROBED)
+
+$(eval $(kernel-module))
 $(eval $(generic-package))