OpenWrt: Save space

- make USB optional
- remove uboot-env tools for mr3020

Signed-off-by: Tim Niemeyer <tim@tn-x.org>
[fabian@blaese.de: Don't strip libs]
Signed-off-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

bsp/ar71xx/.config

@@ -15,7 +15,7 @@ CONFIG_TARGET_DEVICE_PACKAGES_ar71xx_tiny_DEVICE_cpe210-220-v1=""
 CONFIG_TARGET_DEVICE_ar71xx_tiny_DEVICE_cpe510-520-v1=y
 CONFIG_TARGET_DEVICE_PACKAGES_ar71xx_tiny_DEVICE_cpe510-520-v1=""
 CONFIG_TARGET_DEVICE_ar71xx_tiny_DEVICE_tl-mr3020-v1=y
-CONFIG_TARGET_DEVICE_PACKAGES_ar71xx_tiny_DEVICE_tl-mr3020-v1=""
+CONFIG_TARGET_DEVICE_PACKAGES_ar71xx_tiny_DEVICE_tl-mr3020-v1="-uboot-envtools"
 CONFIG_TARGET_DEVICE_ar71xx_tiny_DEVICE_tl-wa850re-v1=y
 CONFIG_TARGET_DEVICE_PACKAGES_ar71xx_tiny_DEVICE_tl-wa850re-v1=""
 CONFIG_TARGET_DEVICE_ar71xx_tiny_DEVICE_tl-wa860re-v1=y
@@ -98,11 +98,6 @@ CONFIG_PACKAGE_kmod-ledtrig-heartbeat=y
 CONFIG_PACKAGE_kmod-ledtrig-netdev=y
 CONFIG_PACKAGE_kmod-nls-base=y
 CONFIG_PACKAGE_kmod-sched-connmark=y
-CONFIG_PACKAGE_kmod-usb-core=y
-CONFIG_PACKAGE_kmod-usb-ehci=y
-CONFIG_PACKAGE_kmod-usb-ledtrig-usbport=y
-CONFIG_PACKAGE_kmod-usb-ohci=y
-CONFIG_PACKAGE_kmod-usb2=y
 CONFIG_PACKAGE_opkg=m
 CONFIG_PACKAGE_qos-scripts=y
 CONFIG_PACKAGE_tc=y