[bsp][nxp][imx] Add FRDM-i.MX91 bsp #10570

Author: xusiwei

.github/ALL_BSP_COMPILE.json

@@ -387,7 +387,8 @@
       "SUB_RTT_BSP": [
         "qemu-virt64-aarch64",
         "raspberry-pi/raspi3-64",
-        "raspberry-pi/raspi4-64"
+        "raspberry-pi/raspi4-64",
+        "nxp/imx/imx91"
       ]
     },
     {

bsp/Copyright_Notice.md

@@ -325,6 +325,17 @@ Path:
 
 - bsp/imx6ul/platform
 
+### imx91
+
+License: bsd-new
+
+Copyright: Copyright 2014-2016 Freescale Semiconductor, Inc.
+           Copyright 2016-2025 NXP
+
+Path:
+
+- bsp/nxp/imx/imx91/drivers/sdk
+
 ### imxrt
 
 License: clear-bsd