dt-bindings: imx-ocotp: Add i.MX8MN compatible

Add compatible for i.MX8MN and add i.MX8MM/i.MX8MN to the description.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20190818093345.29647-2-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/nvmem/imx-ocotp.txt

@@ -2,7 +2,7 @@ Freescale i.MX6 On-Chip OTP Controller (OCOTP) device tree bindings
 
 This binding represents the on-chip eFuse OTP controller found on
 i.MX6Q/D, i.MX6DL/S, i.MX6SL, i.MX6SX, i.MX6UL, i.MX6ULL/ULZ, i.MX6SLL,
-i.MX7D/S, i.MX7ULP and i.MX8MQ SoCs.
+i.MX7D/S, i.MX7ULP, i.MX8MQ, i.MX8MM and i.MX8MN SoCs.
 
 Required properties:
 - compatible: should be one of
@@ -16,6 +16,7 @@ Required properties:
 	"fsl,imx7ulp-ocotp" (i.MX7ULP),
 	"fsl,imx8mq-ocotp" (i.MX8MQ),
 	"fsl,imx8mm-ocotp" (i.MX8MM),
+	"fsl,imx8mn-ocotp" (i.MX8MN),
 	followed by "syscon".
 - #address-cells : Should be 1
 - #size-cells : Should be 1