arm64: dts: freescale: Add FRDM-IMX91 basic support

The FRDM i.MX 91 development board is a low-cost and
compact developmentboard featuring the i.MX 91 applications processor:
https://www.nxp.com/design/design-center/development-boards-and-designs/FRDM-IMX91

Add FRDM-IMX91 board dts support.
- Enable ADC1.
- Enable lpuart1 and lpuart5.
- Enable network eqos and fec.
- Enable I2C bus and children nodes under I2C bus.
- Enable USB and related nodes.
- Enable uSDHC1, uSDHC2 and uSDHC3.
- Enable MU1 and MU2.
- Enable Watchdog3.
- Enable MQS

Co-developed-by: Tom Zheng <haidong.zheng@nxp.com>
Signed-off-by: Tom Zheng <haidong.zheng@nxp.com>
Co-developed-by: Steven Yang <steven.yang@nxp.com>
Signed-off-by: Steven Yang <steven.yang@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Francesco Valla <francesco@valla.it>
Tested-by: Francesco Valla <francesco@valla.it>
Signed-off-by: Joseph Guo <qijian.guo@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: Joseph-Guo-nxp

arch/arm64/boot/dts/freescale/Makefile

@@ -386,6 +386,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8qxp-tqma8xqps-mb-smarc-2.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8ulp-9x9-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8ulp-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx91-11x11-evk.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx91-11x11-frdm.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx91-phyboard-segin.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx91-tqma9131-mba91xxca.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-9x9-qsb.dtb