arm64: dts: imx8mm: Add missing MX8MM_IOMUXC_NAND_READY_B_SD3_RESET_B

The i.MX8M Mini Application Processor Reference Manual, Rev. 3, 11/2020
documents AF MX8MM_IOMUXC_NAND_READY_B_SD3_RESET_B , add it into the
pinmux tables.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-pinfunc.h

@@ -248,6 +248,7 @@
 #define MX8MM_IOMUXC_NAND_RE_B_GPIO3_IO15                                   0x130 0x398 0x000 0x5 0x0
 #define MX8MM_IOMUXC_NAND_RE_B_SIM_M_HADDR11                                0x130 0x398 0x000 0x7 0x0
 #define MX8MM_IOMUXC_NAND_READY_B_RAWNAND_READY_B                           0x134 0x39C 0x000 0x0 0x0
+#define MX8MM_IOMUXC_NAND_READY_B_SD3_RESET_B                               0x134 0x39C 0x000 0x2 0x0
 #define MX8MM_IOMUXC_NAND_READY_B_GPIO3_IO16                                0x134 0x39C 0x000 0x5 0x0
 #define MX8MM_IOMUXC_NAND_READY_B_SIM_M_HADDR12                             0x134 0x39C 0x000 0x7 0x0
 #define MX8MM_IOMUXC_NAND_WE_B_RAWNAND_WE_B                                 0x138 0x3A0 0x000 0x0 0x0