ion: add debug log to clearly account memory held in pools

Presently ion debug interface provides total memory held
in system heap for cached and uncached pool corresponding
to per page order list. Add additional logs to also print
total cumulative bytes held together in these pools so
that it can be accounted easily.

Change-Id: I07dbc45fa99870904cca9b2067b371f4d7247ec5
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>