imx: Support i.MX91 11x11 EVK board

Add i.MX91 11x11 EVK Board support.
 - Four ddr scripts included w/o inline ecc feature.
 - SDHC/NETWORK/I2C/UART supported
 - PCA9451 supported, default nominal drive mode
 - Documentation added.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit ff9f080e59)

doc/board/nxp/imx91_11x11_evk.rst

@@ -0,0 +1,70 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+imx91_11x11_EVK
+=======================
+
+U-Boot for the NXP i.MX91 11x11 EVK
+
+Quick Start
+-----------
+
+- Get and Build the ARM Trusted firmware
+- Get the DDR firmware
+- Get ahab-container.img
+- Build U-Boot
+- Boot
+
+Get and Build the ARM Trusted firmware
+--------------------------------------
+
+Note: srctree is U-Boot source directory
+Get ATF from: https://github.com/nxp-imx/imx-atf/
+branch: lf_v2.10
+
+.. code-block:: bash
+
+   $ unset LDFLAGS
+   $ make PLAT=imx91 bl31
+   $ cp build/imx91/release/bl31.bin $(srctree)
+
+Get the DDR firmware
+--------------------
+
+.. code-block:: bash
+
+   $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.21.bin
+   $ chmod +x firmware-imx-8.21.bin
+   $ ./firmware-imx-8.21.bin
+   $ cp firmware-imx-8.21/firmware/ddr/synopsys/lpddr4*.bin $(srctree)
+
+Get ahab-container.img
+---------------------------------------
+
+.. code-block:: bash
+
+   $ wget  https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-ele-imx-1.3.0-17945fc.bin
+   $ chmod +x firmware-ele-imx-1.3.0-17945fc.bin
+   $ ./firmware-ele-imx-1.3.0-17945fc.bin
+   $ cp firmware-ele-imx-1.3.0-17945fc/mx91a0-ahab-container.img $(srctree)
+
+Build U-Boot
+------------
+
+.. code-block:: bash
+
+   $ export CROSS_COMPILE=aarch64-poky-linux-
+   $ make imx91_11x11_evk_defconfig or imx91_11x11_evk_inline_ecc_defconfig
+   $ make
+
+- Inline ECC is to enable DDR ECC feature with imx91_11x11_evk_inline_ecc_defconfig
+
+Burn the flash.bin to MicroSD card offset 32KB:
+
+.. code-block:: bash
+
+   $ dd if=flash.bin of=/dev/sd[x] bs=1024 seek=32 conv=notrunc
+
+Boot
+----
+
+Set Boot switch to SD boot

doc/board/nxp/index.rst

@@ -12,6 +12,7 @@ NXP Semiconductors
    imx8mq_evk
    imx8qxp_mek
    imx8ulp_evk
+   imx91_11x11_evk
    imx93_9x9_qsb
    imx93_11x11_evk
    imxrt1020-evk