DTrace is known to work on armv6, enable building it as a module.

Reviewed by:	imp
Sponsored by:	ABT Systems Ltd
Differential Revision:	https://reviews.freebsd.org/D4221

sys/conf/kern.opts.mk

@@ -59,7 +59,10 @@ __DEFAULT_NO_OPTIONS = \
 
 # Things that don't work based on the CPU
 .if ${MACHINE_CPUARCH} == "arm"
-BROKEN_OPTIONS+= CDDL ZFS
+BROKEN_OPTIONS+= ZFS
+. if ${MACHINE_ARCH:Marmv6*} == ""
+BROKEN_OPTIONS+= CDDL
+. endif
 .endif
 
 .if ${MACHINE_CPUARCH} == "mips"

sys/modules/Makefile

@@ -403,7 +403,8 @@ _autofs=	autofs
 .endif
 
 .if ${MK_CDDL} != "no" || defined(ALL_MODULES)
-.if ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips" && \
+.if (${MACHINE_CPUARCH} != "arm" || ${MACHINE_ARCH:Marmv6*} == "") && \
+	${MACHINE_CPUARCH} != "mips" && \
 	${MACHINE_CPUARCH} != "sparc64"
 SUBDIR+=	dtrace
 .endif