staging: ks7010: use u16 as cast type in hostif_start_request

Use u16 as cast type in hostif_start_request function replacing
uint16_t which was being used.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>