staging: vt6655: Use loop in vt6655_mac_write_bssid_addr

Use loop in vt6655_mac_write_bssid_addr to avoid multiple
similar statements.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/b3b93ae7ce41562565e9007eb4580b9c47a2881f.1657134099.git.philipp.g.hortmann@gmail.com


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