Relocate common quota functions to shared code

The quota functions are common to all implementations and can be
moved to common code.  As a simplification they were moved to the
Linux platform code in the initial refactoring.

Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@ixsystems.com>
Closes #9710

module/os/linux/zfs/zfs_acl.c

@@ -42,6 +42,7 @@
 #include <sys/zfs_fuid.h>
 #include <sys/zfs_acl.h>
 #include <sys/zfs_dir.h>
+#include <sys/zfs_quota.h>
 #include <sys/zfs_vfsops.h>
 #include <sys/dmu.h>
 #include <sys/dnode.h>