staging: vt6655: remove duplicate code

In the definition of vnt_init_bands(), there are two sections of
code that are very similar. Unifying them through a new
function that takes care of initialization of a single band.

Signed-off-by: Edmundo Carmona Antoranz <eantoranz@gmail.com>
Link: https://lore.kernel.org/r/20210314145943.1933245-3-eantoranz@gmail.com


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