linux: restore DEPMOD usage

The linux.mk rewrite lost the DEPMOD setting while installing modules
which means depending on host-module-init-tools has been useless.
Instead, the build system has been executing /sbin/depmod.

While we're here, drop the INSTALL_MOD_PATH since LINUX26_MAKE_FLAGS
already contains it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

linux/linux.mk

@@ -132,7 +132,7 @@ $(LINUX26_DIR)/.stamp_installed: $(LINUX26_DIR)/.stamp_compiled
 	# directories, not relevant on the target
 	@if [ $(shell grep -c "CONFIG_MODULES=y" $(LINUX26_DIR)/.config) != 0 ] ; then 	\
 		$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX26_MAKE_FLAGS) -C $(@D) 		\
-			INSTALL_MOD_PATH=$(TARGET_DIR) modules_install ;		\
+			DEPMOD="$(HOST_DIR)/usr/sbin/depmod" modules_install ;		\
 		rm -f $(TARGET_DIR)/lib/modules/$(LINUX26_VERSION_PROBED)/build ;	\
 		rm -f $(TARGET_DIR)/lib/modules/$(LINUX26_VERSION_PROBED)/source ;	\
 	fi