debug: Correct most of the sector_t printf()s
The 'll' printf modifier is currently broken. Fortunately all but
one of the uses is printing MB instead of bytes, which means we can
cast the value to a 'unsigned long' without risk of overflow/wraps.
...There's one remaining use ('%llx') which still needs to be sorted
out.
Change-Id: I89f406f6c085be153531d1ec1f2a314ae172b129