staging: vt6655: remove unused bb_power_save_mode_on() function

The function bb_power_save_mode_on() is not used anywhere, remove it.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20230317065041.16635-2-straube.linux@gmail.com


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