Merge git://git.denx.de/u-boot-uniphier

- Fix unmet direct dependencies warning
- Remove old sLD3 SoC support
- Update reset data
- Add dr_mode DT property to avoid warning

ARM: uniphier: remove sLD3 SoC support

This SoC is too old. It is difficult to maintain any longer.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>