Merge tag 'arm-soc/for-5.1/devicetree-arm64' of https://github.com/Broadcom/stblinux into arm/dt

This pull request contains Broadcom ARM64-based SoCs Device Tree updates
for 5.1, please pull the following:

- Stefan adds support for the Raspberry Pi 3 A+ by using the same
  mechanism of creating a symbolic reference to the ARM 32-bit DTS file

* tag 'arm-soc/for-5.1/devicetree-arm64' of https://github.com/Broadcom/stblinux

:
  arm64: dts: broadcom: Add reference to RPi 3 A+
  ARM: dts: add Raspberry Pi 3 A+

Signed-off-by: Arnd Bergmann <arnd@arndb.de>