Auto generate /etc/default/packet-forwarder

package/packet-forwarder/packet-forwarder

@@ -1,2 +0,0 @@
-# GPIO connected to SW1301 reset pin
-SX1301_RESET_BCM_PIN=17

package/packet-forwarder/packet-forwarder.mk

@@ -8,12 +8,13 @@ endef
 
 define PACKET_FORWARDER_BUILD_CMDS
     LGW_PATH=$(STAGING_DIR)/opt/ttn/libloragw CROSS_COMPILE=$(TARGET_CROSS) LD=$(TARGET_LD) $(TARGET_MAKE_ENV) $(MAKE) -C $(@D) all
+    echo "SX1301_RESET_BCM_PIN=$(BR2_PACKAGE_PACKET_FORWARDER_RST_GPIO)" > $(@D)/packet-forwarder
 endef
 
 define PACKET_FORWARDER_INSTALL_TARGET_CMDS
     $(INSTALL) -D -m 0755 $(@D)/poly_pkt_fwd/poly_pkt_fwd $(TARGET_DIR)/usr/bin/poly_pkt_fwd
     $(INSTALL) -D -m 0644 $(@D)/poly_pkt_fwd/global_conf.json $(TARGET_DIR)/etc/ttn/global_conf.json
-    $(INSTALL) -D -m 0644 $(PACKET_FORWARDER_PKGDIR)/packet-forwarder $(TARGET_DIR)/etc/default/packet-forwarder
+    $(INSTALL) -D -m 0644 $(@D)/packet-forwarder $(TARGET_DIR)/etc/default/packet-forwarder
 endef
 
 define PACKET_FORWARDER_INSTALL_INIT_SYSV