Merge tag 'video-for-2019.07-rc1' of git://git.denx.de/u-boot-video

- optional backlight PWM polarity config via polarity cell
- bug fix for ASCII characters > 127
- ANSI sequence handling extensions (implement clear line,
  reverse video and relative cursor movement commands)
- preparation for doing character set translations
- left/right and up/down arrow keys translation to ANSI
  control sequences for cursor movement to fix selection
  with an USB keyboard in bootmenu
- CONFIG_SYS_WHITE_ON_BLACK font scheme configuration for
  sunxi boards