staging: ft1000: change write_block_fifo() header to /* */ style in ft1000_download.c

As per coding style, C99 comments are not allowed
removed some redundant information and empty space
Left the parameter descriptions because the
parameter list is long and cryptic looking

Signed-off-by: Kelley Nielsen <kelleynnn@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>