iopsys: fix issues related to updated genconfig
I got two errors when testing genconfig with support for old and new paths.
The change in genconfig.sh for searching seems to be somewhat wrong. I fail to understand why so I changed the design a little. The error received was: package/feeds/iopsys/iop/scripts/genconfig.sh: line 380: [: feeds/custom_devices/devices/brcmbca/config/smarthub3/config: binary operator expected
The change in feeds_update.sh was made to fix this:
target/linux/feed-devices/feed-devices-list.mk:FEED_DEVICES_DIRS+=(TOPDIR)/feeds/shsw/devicesFEED_DEVICES_DIRS+=
(TOPDIR)/feeds/custom_devices/devices
Now that there are more than one path we should use a space in order to separate them.