base

Add data from /proc/pagetypeinfo to procstats.

This data tells us the number of pages of each type that
are available by page size.  It is collected each time
the procstats snapshot is taken, and printed in the
checkin and verbose (dumpsys procstats -a) modes.

Change-Id: I14562eac15833617391c560638a9e7d239ef8db6