staging: ks7010: avoid no needed cast in ks_wlan_cap

In ks_wlan_cap there is a cast to uint16_t to use cpu_to_le16
with variable 'capability' which is already defined as u16.
Avoid this cast to clean code.

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