Merge branch 'master' of https://source.denx.de/u-boot/custodians/u-boot-sunxi

The main attraction are two regressions, plus a fix
for a long standing bug:
- Fix USB support on boards with a switched VBUS regulator.
- Fix failing boot due to env loading on boards without MMC (CHIP).
- Fix PSCI CPU_OFF operation on R40 boards.
The rest are smaller fixes, and the forgotten DT sync for sun4i boards.