perf machine: Remove unused struct process_args

After commit a93f0e55 ("perf symbols: Get kernel start address by symbol
name"), no one uses struct process_args any more, so remove it.
Signed-off-by: Yuan Can <yuancan@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/linux-perf-users/20220927013931.110475-2-yuancan@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/machine.c

@@ -1128,10 +1128,6 @@ static struct dso *machine__get_kernel(struct machine *machine)
 	return kernel;
 }
 
-struct process_args {
-	u64 start;
-};
-
 void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 				    size_t bufsz)
 {