[BUG]u-boot no boots from SD-card on NXP T2080RDB development board

[Jeff Hering]

The 2020.10 tagged build works on the T2080RDB card, however, all tags starting with 2021.01-rc1 no long boot from SD-card on the development system. This might also apply to other QorIQ development boards.

Here is a dump of the crash which occurs very early in the process (the left column is a timestamp):

000000.000: .
000000.409:
000000.410: SD boot...
000000.415: No max bus width provided. Assume 8-bit supported.
000003.972: MMC init failed
000003.975: Initializing....using SPD
000004.323: 2 GiB left unmapped
000004.327: Bad trap at PC: 200000, SR: 21200, vector=800
000004.332: NIP: 00000000 XER: 00000000 LR: 00000000 REGS: 200000 TRAP: 2000
000004.334: 0000 DAR: 00000000
000004.338: MSR: 00021200 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 00
000004.338:
000004.344: GPR00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
000004.351: GPR08: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
000004.358: GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
000004.365: GPR24: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
000004.368: Call backtrace:
000004.371: Exception in kernel pc 200000 signal 0
000004.375: ### ERROR ### Please RESET the board ###