Merge tag 'rockchip-fixes-for-2019.04' of git://git.denx.de/u-boot-rockchip

Last-minute fixes for Rockchip for 2019.04:
- reverts the deprecation of the 'download-key' detection
  (with a full solution pending for the next release)
- applies a temporary fix for the 32bit pinctrl registers on the RK3288