malloc: fix combined lib build

malloc: fix combined lib build

Malloc was moved to the EAL and dummy malloc library was left
to not break apps that had a librte_malloc.so dependency.
Note that the dummy library will be removed in the next release.

When building a combined library, all objects are copied to the same
directory before creating the library itself.

There are a few issues:
 - CONFIG_RTE_LIBRTE_MALLOC is not a valid option anymore resulting
 in wrong syntax and a compilation failure. Fix it by replacing it
 with CONFIG_RTE_LIBRTE_EAL.
 - As we kept a dummy library, there are now two objects with the
 same name. This means that the proper rte_malloc.o object in eal gets
 overwritten by an empty rte_malloc.o object from the dummy malloc lib.
 Fix it by changing the name of rte_malloc.o object in the dummy
 library.
 - Update the copyright year.

Fixes: 2f9d47013e4dbb738 ("mem: move librte_malloc to eal/common")
Reported-by: Alin Rauta <alin.rauta@intel.com>
Signed-off-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>