staging: unisys: replace kzalloc/kfree with UISMALLOC/UISFREE

It doesn't need to trace status of buffer when buffers are
allocated/deallocated. So stuff of tracing memory status
are removed. And also UISMALLOC/UISFREE macro are removed
completetly. just use kzalloc/kfree.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>