brcm47xx: drop some personal profiles

brcm47xx: drop some personal profiles

WL500GPv1 profile included ath5k which made it usable only for people
who decided to replace default BCM4318 card with Atheros one. We can't
have profile for every possible configuration. If someone adjusts hw in
such a way he can always install a proper package.

WRTSL54GS profile got extra packages for a specific USB usage. Our
standard profile provides basic USB and we should stick to this. We
can't make everyone happy by including packages for all common USB use
cases and all common filesystems.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>