imx: add i.MX8MN DDR4 board support
Support pinctrl/clk/sdhc, include ddr4 timing data.
Log:
U-Boot SPL
2019.10-rc3-00356-g497c500423-dirty (Sep 16 2019 - 10:54:58 +0800)
Normal Boot
Trying to boot from BOOTROM
image offset 0x8000, pagesize 0x200, ivt offset 0x0
U-Boot
2019.10-rc3-00356-g497c500423-dirty (Sep 16 2019 - 10:54:58 +0800)
CPU: Freescale i.MX8MNano rev1.0 at 24 MHz
Reset cause: POR
Model: NXP i.MX8MNano DDR4 EVK board
DRAM: 2 GiB
MMC: FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... *** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: No ethernet found.
Hit any key to stop autoboot: 0
Signed-off-by: Peng Fan <peng.fan@nxp.com>