mem: rename function returning hugepage data path

mem: rename function returning hugepage data path

The original name for this path was not too descriptive and
confusing. Rename it to a more appropriate and descriptive name:
it stores data about hugepages, so name it eal_hugepage_data_path().

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Reviewed-by: Reshma Pattan <reshma.pattan@intel.com>