staging: ks7010: eap, change unsigned short to __be16

Sparse emits warning: cast to restricted __be16. EAP header uses
network byte order. The structures used to describe it should use
__beXX data types.

Change data type unsigned short -> __be16.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>