Perf and PMU updates including support for Cortex-A78 and the v8.3 SPE
extensions.

* for-next/perf:
  drivers/perf: Replace spin_lock_irqsave to spin_lock
  dt-bindings: arm: add Cortex-A78 binding
  arm64: perf: add support for Cortex-A78
  arm64: perf: Constify static attribute_group structs
  drivers/perf: Prevent forced unbinding of ARM_DMC620_PMU drivers
  perf/arm-cmn: Move IRQs when migrating context
  perf/arm-cmn: Fix PMU instance naming
  perf: Constify static struct attribute_group
  perf: hisi: Constify static struct attribute_group
  perf/imx_ddr: Constify static struct attribute_group
  perf: qcom: Constify static struct attribute_group
  drivers/perf: Add support for ARMv8.3-SPE