staging: vt6655: Rename function MACvSetBBType

Rename MACvSetBBType function to vt6655_mac_set_bb_type to avoid
CamelCase which is not accepted by checkpatch.pl and to clean up
namespace.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/44d0151d67e2a76e1cf3d88d254defa96990b142.1661666677.git.philipp.g.hortmann@gmail.com


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