util: refine hg_mem_get_page_size
util: refine hg_mem_get_page_size

Avoid querying pagesize every time

Signed-off-by: Johann Lombardi <ea3b341c05f4fbc48dcf990d0a867085209b1dda@intel.com>

mercury-hpc/mercury,mercury-hpc/mercury,mercury-hpc/mercury,mercury-hpc/mercury