global: Convert simple_strtoul() with decimal to dectoul()

It is a pain to have to specify the value 10 in each call. Add a new
dectoul() function and update the code to use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/ti/pd.c b/cmd/ti/pd.c
index 9e820b8..008668f 100644
--- a/cmd/ti/pd.c
+++ b/cmd/ti/pd.c
@@ -119,8 +119,8 @@
 	if (!data)
 		return CMD_RET_FAILURE;
 
-	psc_id = simple_strtoul(argv[1], NULL, 10);
-	lpsc_id = simple_strtoul(argv[2], NULL, 10);
+	psc_id = dectoul(argv[1], NULL);
+	lpsc_id = dectoul(argv[2], NULL);
 
 	for (i = 0; i < data->num_lpsc; i++) {
 		lpsc = &data->lpsc[i];