cddl/*: add a WITH(OUT)_DTRACE option

cddl/*: add a WITH(OUT)_DTRACE option

Add an option to enable/disable DTrace without disabling ZFS.  New
architectures such as CHERI may support ZFS before they support DTrace
and the old model of WITHOUT_CDDL disabling both wasn't helpful.

For compatiblity, the CDDL option remains and WITHOUT_CDDL implies
WITHOUT_DTRACE.  WITHOUT_DTRACE also implies WITHOUT_CTF.

As part of this change, largely convert cddl/*/Makefile to using the
more compact SUBDIR.${MK_<FOO>}+= form rather than using intermediate
variables.

Reviewed by:	markj
Obtained from:	CheriBSD
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D35718