staging: vt6655: Type conversion was made.

This patch fixes this sparse warning:
drivers/staging/vt6655/device_main.c:385:40: warning: mixing different enum types
drivers/staging/vt6655/device_main.c:385:40:     int enum _VIA_BB_TYPE versus
drivers/staging/vt6655/device_main.c:385:40:     int enum _VIA_PKT_TYPE

Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>