lib: fix cache alignment of structures

lib: fix cache alignment of structures

Include rte_memory.h for lib files that use __rte_cache_aligned
attribute.

Consider the following code:

	struct per_core_foo {
		...
	} __rte_cache_aligned;

	struct global_foo {
		struct per_core_foo foo[RTE_MAX_CORE];
	};

If __rte_cache_aligned is not defined (rte_memory.h is not included),
the code compiles but the structure is not aligned... it defines the
structure and creates a global variable called __rte_cache_aligned.
And this can lead to really bad things if this code is in a .h that
is included by files that may or may not include rte_memory.h

Signed-off-by: Jia Yu <jyu@vmware.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>