Merge tag 'arm-soc/for-6.12/soc' of https://github.com/Broadcom/stblinux into soc/arm

This pull request contains Broadcom 32-bit SoC changes for 6.12, please
pull the following:

- Florian enables the ARM GICv3 driver since newer STB chips make use of
  a GIC-600 controller

* tag 'arm-soc/for-6.12/soc' of https://github.com/Broadcom/stblinux:
  ARM: bcm: Select ARM_GIC_V3 for ARCH_BRCMSTB