mempool/dpaa: prepare to remove register memory area op

mempool/dpaa: prepare to remove register memory area op

Populate mempool driver callback is executed a bit later than
register memory area, provides the same information and will
substitute the later since it gives more flexibility and in addition
to notification about memory area allows to customize how mempool
objects are stored in memory.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>