smem: add new recipe

smem is a tool that can give numerous reports on memory usage on Linux systems.
Unlike existing tools, smem can report proportional set size (PSS),
which is a more meaningful representation of the amount of memory used
by libraries and applications in a virtual memory system.

Signed-off-by: Li Xin <lixin.fnst@cn.fujitsu.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>