dtrace: convert FBT blacklist to RB-tree

dtrace: convert FBT blacklist to RB-tree

The blacklist for FBT was implemented as a sorted list, populated from
a static list of functions.  In order to allow functions to be added
from other places (i.e. programmatically), it has been converted to an
RB-tree with an API to add functions and to traverse the list.  It is
still possible to add functions by address or to add them by symbol
name, to be resolved into the corresponding address.

Orabug: 26190412
Signed-off-by: Tomas Jedlicka <tomas.jedlicka@oracle.com>
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Acked-by: Nick Alcock <nick.alcock@oracle.com>