dio_sparse: Set timeout 30 min

ADSP075 (dio_sparse  -w 518192k -s 518192k -n 1000) tends to timeout,
this is a minimal pre-release fix that just increases the
tst_test->timeout unconditionally.

Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>
Acked-by: Martin Doucha <mdoucha@suse.cz>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

Author: pevik

testcases/kernel/io/ltp-aiodio/dio_sparse.c

@@ -135,4 +135,5 @@ static struct tst_test test = {
 		"tmpfs",
 		NULL
 	},
+	.timeout = 1800,
 };