pinctrl: imx6: support i.MX6ULL

There two iomuxc for i.MX6ULL. one iomuxc is compatible is i.MX6UL,
the other iomuxc is for SVNS usage, similar with the one in mx7.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Simon Glass <sjg@chromium.org>

drivers/pinctrl/nxp/pinctrl-imx6.c

@@ -12,6 +12,10 @@
 
 static struct imx_pinctrl_soc_info imx6_pinctrl_soc_info;
 
+static struct imx_pinctrl_soc_info imx6_snvs_pinctrl_soc_info = {
+	.flags = ZERO_OFFSET_VALID,
+};
+
 static int imx6_pinctrl_probe(struct udevice *dev)
 {
 	struct imx_pinctrl_soc_info *info =
@@ -26,6 +30,7 @@ static const struct udevice_id imx6_pinctrl_match[] = {
 	{ .compatible = "fsl,imx6sl-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
 	{ .compatible = "fsl,imx6sx-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
 	{ .compatible = "fsl,imx6ul-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
+	{ .compatible = "fsl,imx6ull-iomuxc-snvs", .data = (ulong)&imx6_snvs_pinctrl_soc_info },
 	{ /* sentinel */ }
 };