Fix quota.h includes

quota.h currently relies on asm/semaphore.h (through some chain; it
doesn't actually include semaphore.h itself) to include wait.h.  As
well as being bad practice to rely on an implicit include, subsequent
patches will break this.  While I'm in this file, add atomic.h and
list.h, and sort the list of includes.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>