bump Amlogic to something half-usable #4949
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This is a subset of changes from my current WIP branch to get the ball rolling on nightly builds again, although please note there are no plans to formally release anything for LE10. I have deliberately ommitted alsa-lib changes from this PR as I'm waiting on feedback for this change (https://patchwork.kernel.org/project/linux-amlogic/patch/[email protected]/) before squashing or abandoning changes in my kernel branch. I also need to clean up u-boot patches a little once the 2021.04 merge window closes. I'll deal with both patchsets in a follow-up PR.
NB: Support for Odroid N2+ is added but I've kept this as a single UBOOT_SYSTEM device. As N2/N2+ have a different CPU revision and this is detectable I'm planning to add some code to the u-boot board files that allows FDTDIR use and boot time detection to load the right dtb if both are present (similar to how iMX6 devices work). It's possible for the N2+ to boot from the N2 dtb; from an LE perspective it will just run slower due to missing CPU opp points.
No other new UBOOT_SYSTEM devices are added in this PR.
I'm also using Linux 5.11-rc kernels to reduce the large kernel patch-set that I'm using. As there is no plan to release LE10 images we don't need to track the same kernel base.