Realtek ARM64 SoC for v4.12

This adds a Kconfig symbol for DTs being added, plus a MAINTAINERS entry.

* tag 'realtek-arm64-soc-for-4.12' of git://github.com/afaerber/linux:
  MAINTAINERS: Add Realtek section
  ARM64: Prepare Realtek RTD1295
Signed-off-by: Olof Johansson <olof@lixom.net>