pinctrl: imx25: ensure that a pin with id i is at position i in the info array

The code in pinctrl-imx.c only works correctly if in the
imx_pinctrl_soc_info passed to imx_pinctrl_probe we have:

	info->pins[i].number = i
	conf_reg(info->pins[i]) = 4 * i

(which conf_reg(pin) being the offset of the pin's configuration
register).

When the imx25 specific part was introduced in b4a87c9b966f ("pinctrl:
pinctrl-imx: add imx25 pinctrl driver") we had:

	info->pins[i].number = i + 1
	conf_reg(info->pins[i]) = 4 * i

. Commit 34027ca2bbc6 ("pinctrl: imx25: fix numbering for pins") tried
to fix that but made the situation:

	info->pins[i-1].number = i
	conf_reg(info->pins[i-1]) = 4 * i

which is hardly better but fixed the error seen back then.

So insert another reserved entry in the array to finally yield:

	info->pins[i].number = i
	conf_reg(info->pins[i]) = 4 * i

Fixes: 34027ca2bbc6 ("pinctrl: imx25: fix numbering for pins")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/pinctrl-imx25.c

@@ -26,7 +26,8 @@
 #include "pinctrl-imx.h"
 
 enum imx25_pads {
-	MX25_PAD_RESERVE0 = 1,
+	MX25_PAD_RESERVE0 = 0,
+	MX25_PAD_RESERVE1 = 1,
 	MX25_PAD_A10 = 2,
 	MX25_PAD_A13 = 3,
 	MX25_PAD_A14 = 4,
@@ -169,6 +170,7 @@ enum imx25_pads {
 /* Pad names for the pinmux subsystem */
 static const struct pinctrl_pin_desc imx25_pinctrl_pads[] = {
 	IMX_PINCTRL_PIN(MX25_PAD_RESERVE0),
+	IMX_PINCTRL_PIN(MX25_PAD_RESERVE1),
 	IMX_PINCTRL_PIN(MX25_PAD_A10),
 	IMX_PINCTRL_PIN(MX25_PAD_A13),
 	IMX_PINCTRL_PIN(MX25_PAD_A14),