Replace the completely arbitrary '3' with '9' for the number of frame…

…s to

skip using the DTrace 'profile' provider on ARM.  This causes stack traces
to skip various driver-and callout-related things as they do on x86, where
the likewise arbitrary values are '6' (32-bit) and '10' (64-bit) for
similar sorts of reasons.

MFC after:	3 days
Sponsored by:	DARPA, AFRL

sys/cddl/dev/profile/profile.c

@@ -135,7 +135,7 @@ struct profile_probe_percpu;
 
 #ifdef __arm__
 /* bogus */
-#define	PROF_ARTIFICIAL_FRAMES	3
+#define	PROF_ARTIFICIAL_FRAMES	9
 #endif
 
 typedef struct profile_probe {