staging: vt6655: Remove unused byRFType in baseband.c

Remove byRFType that support 5GHz band.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/198341a249ea67acbf1be00b6465aa6a4eaef6e1.1646512837.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>