Staging: rtl8192u: dont use -mhard-float

rtl8192u uses -mhard-float, which doesn't exist on ia64. Since in-kernel
floating-point isn't allowed, this is implied anyway.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>