For once this adds USB support for two SoCs: the H616 and the F1C100s
series. The rest is support for LPDDR3 DRAM chips on H616 boards.
Gitlab CI passed, and I booted that briefly on an H616 and an F1C200s
board. I don't have an H616 board with LPDDR3 DRAM, but reportedly that
works for Mikhail, and doesn't regress on my DDR3 boards.