mm: add common Makefile include: libmem.mk

libmem.mk is used as a common Makefile used by tests under mem/ dir to
avoid duplicated libmem-related lines.

Signed-off-by: Caspar Zhang <caspar@casparzhang.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
10 files changed