scripts/metadata.pl: avoid adding depends and select for the same symbol

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41160 3c298f89-4303-0410-b956-a3cf2f4a3e73
rt2x00: fix crash when using TKIP on USB devices

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41161 3c298f89-4303-0410-b956-a3cf2f4a3e73
b43: fix a regression on G-PHY devices

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41162 3c298f89-4303-0410-b956-a3cf2f4a3e73