uboot-imx

LF-722 mx7ulp: Add the new DTB path of usdhc0 node in v5.4 kernel

V5.4 kernel has updated its DTB with new nodes' name. So when booting
from USB, u-boot fails to find usdhc0 node from kernel DTB and can't fix
it to 3.3v.
This is necessary because when serial download mode, M4 won't run. So kernel
will fails to run virtual PMIC driver, it causes eMMC driver fails to get
1.8v regulator in its probe.

Signed-off-by: Ye Li <ye.li@nxp.com>
Tested-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit 81c2f9bfa7d862e951eb2716157207787789e260)