[U-Boot] fw_setenv on protected flash

[Eibach, Dirk]

Some of your recent cfi flash driver enhancements have made flash
protect/unprotect work on our NOR based platforms (S29GL512). Good news
so far, but as a consequence fw_setenv is woking no more:
MTD erase error on /dev/mtd5: Input/output error
Error: can't write fw_env to flash

Also flash_unlock from mtd_utils is not doing the trick:
Could not unlock MTD device: /dev/mtd5

Unprotecting flash in u-boot before booting linux makes this work, but
this is probably no good idea.

So what is the recommended workflow for fw_setenv on protected flash?

Cheers
Dirk
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