dm: Tidy up dump output when there are many devices

At present the 'Index' column of 'dm tree' assumes there is
two digits, this patch increase it to 3 digits.

It also aligns output of 'dm uclass', assuming the same 3 digits index.

The boards with CONFIG_PINCTRL_FULL activated have one pinconfig
by pin configuration, so they can have more than 100 devices
pinconfig (for example with stm32mp157c-ev1 board we have
106 pinconfig node).

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/tests/test_bind.py b/test/py/tests/test_bind.py
index ccf6d62..2d48484 100644
--- a/test/py/tests/test_bind.py
+++ b/test/py/tests/test_bind.py
@@ -13,7 +13,7 @@
 	else:
 		leaf = leaf + '`'
 	leaf = leaf + '-- ' + name
-	line = (' *{:10.10}   [0-9]*  \[ [ +] \]   {:20.20}  {}$'
+	line = (' *{:10.10}    [0-9]*  \[ [ +] \]   {:20.20}  {}$'
 	        .format(uclass, drv, leaf))
 	prog = re.compile(line)
 	for l in lines: