spidev-test: Add license

Add GPL-2.0-only license.

Signed-off-by: Jan Kardell <[email protected]>
Link: https://patchwork.ozlabs.org/project/openwrt/patch/[email protected]/
Signed-off-by: Hauke Mehrtens <[email protected]>

package/utils/spidev_test/Makefile

@@ -14,6 +14,8 @@ PKG_RELEASE:=1
 PKG_BUILD_DIR:=$(LINUX_DIR)/tools/spi-$(TARGET_DIR_NAME)
 PKG_BUILD_PARALLEL:=1
 
+PKG_LICENSE:=GPL-2.0-only
+
 include $(INCLUDE_DIR)/package.mk
 
 define Package/spidev-test