staging: ks7010: change some casts from uint8_t to u8 in ks_hostif header

This commit changes some type cast in rate related preprocessor
definitions included in ks_hostif header file to use preferred
u8 type.

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