mark arm.arm (v4/v5) kernels as NO_UNIVERSE for now

r354290 removed arm.arm from universe, but arm.arm kernels were still
found and built during the kernel stage.  I'm not aware of a better way
to address this at the moment, but since there aren't many arm.arm
kernels anyhow just add an explicit NO_UNIVERSE to them.

Reported by:	rpokala

sys/arm/conf/DB-78XXX

@@ -3,6 +3,7 @@
 #
 # $FreeBSD$
 #
+#NO_UNIVERSE
 
 ident		DB-88F78XX
 include 	"std.arm"

sys/arm/conf/DB-88F5XXX

@@ -3,6 +3,7 @@
 #
 # $FreeBSD$
 #
+#NO_UNIVERSE
 
 ident		DB-88F5XXX
 include 	"std.arm"

sys/arm/conf/DB-88F6XXX

@@ -3,6 +3,7 @@
 #
 # $FreeBSD$
 #
+#NO_UNIVERSE
 
 ident		DB-88F6XXX
 include 	"std.arm"

sys/arm/conf/RT1310

@@ -3,6 +3,7 @@
 #
 # $FreeBSD$
 #
+#NO_UNIVERSE
 
 ident		RT1310
 include 	"std.arm"

sys/arm/conf/TS7800

@@ -3,6 +3,7 @@
 #
 # $FreeBSD$
 #
+#NO_UNIVERSE
 
 ident		TS7800
 include 	"std.arm"