linux: update paths to compiled cpio files

Linux has been using "usr/initramfs_data.cpio" for a few releases as the
generated cpio name, so the buildroot match of "...cpio.*" won't actually
clean out the previous result.

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

@@ -147,7 +147,7 @@ $(LINUX26_DIR)/.stamp_initramfs_rebuilt: $(LINUX26_DIR)/.stamp_installed $(BINAR
 	@$(call MESSAGE,"Rebuilding kernel with initramfs")
 	# Remove the previously generated initramfs which was empty,
 	# to make sure the kernel will actually regenerate it.
-	$(RM) -f $(@D)/usr/initramfs_data.cpio.*
+	$(RM) -f $(@D)/usr/initramfs_data.cpio*
 	# Build the kernel.
 	$(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) $(LINUX26_IMAGE_NAME)
 	# Copy the kernel image to its final destination