staging: ks7010: use le16_to_cpu() to access __le16 field

Fixes sparse warning:
drivers/staging/ks7010/ks_hostif.c:959:24: warning: restricted __le16
degrades to integer

Signed-off-by: Richard Porter <dick@acm.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>