[media] coda: remove extraneous TRACE_SYSTEM_STRING

The coda tracing code causes lots of warnings like

In file included from /git/arm-soc/include/trace/define_trace.h:90:0,
from /git/arm-soc/drivers/media/platform/coda/trace.h:203,
from /git/arm-soc/drivers/media/platform/coda/coda-bit.c:34:
/git/arm-soc/include/trace/ftrace.h:28:0: warning: "TRACE_SYSTEM_STRING" redefined
#define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
^
In file included from /git/arm-soc/include/trace/define_trace.h:83:0,
from /git/arm-soc/drivers/media/platform/coda/trace.h:203,
from /git/arm-soc/drivers/media/platform/coda/coda-bit.c:34:
/git/arm-soc/drivers/media/platform/coda/./trace.h:12:0: note: this is the location of the previous definition
#define TRACE_SYSTEM_STRING __stringify(TRACE_SYSTEM)

>From what I can tell, this is just the result of a bogus TRACE_SYSTEM_STRING
definition, and removing that one makes the warnings go away.

Fixes: 9a1a8f9953f ("[media] coda: Add tracing support")

Signed-off-by: Arnd Bergmann <[e-mail]>
Acked-by: Philipp Zabel <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/coda/trace.h

···
 
 #include "coda.h"
 
-#define TRACE_SYSTEM_STRING __stringify(TRACE_SYSTEM)
-
 TRACE_EVENT(coda_bit_run,
 	TP_PROTO(struct coda_ctx *ctx, int cmd),