[ANN] U-Boot v2020.10-rc4 released

Hey all,

It's release day and I'm getting this one out on schedule again. With this release, I'm also opening up -next and will start by testing the NR_DRAM_BANKS PR and go from there on other series that are in my TODO list.

Once again, for a changelog, git log --merges v2020.10-rc3..v2020.10-rc4 and as always, I ask for more details in the PRs people send me so I can put them in the merge commit.

I'm going to continue with every-other-week RCs on Mondays and release on October 5th. Thanks all!