Enable build of FDT components by default. dtc is a required build tool

for all FDT-enabled kernels, and having it off by default means that
building these kernels fails by default. This fixes FDT-related build
failures in make universe on ARM and PowerPC.

Reviewed by:	imp

share/mk/bsd.own.mk

@@ -326,6 +326,7 @@ _clang_no=CLANG
     DICT \
     DYNAMICROOT \
     EXAMPLES \
+    FDT \
     FLOPPY \
     FORTH \
     FP_LIBC \
@@ -421,7 +422,6 @@ MK_${var}:=	yes
     BIND_XML \
     BSD_GREP \
     ${_clang_no} \
-    FDT \
     GPIO \
     HESIOD \
     IDEA