Merge changes from topic "us_dsu_pmu" into integration

* changes:
  feat(tc): enable Last-level cache (LLC)
  feat(cpus): add sysreg_bitfield_insert_from_gpr macro
  feat(tc): add DSU PMU node for tc3
  feat(tc): enable el1 access to DSU PMU registers
  style(tc): remove comment for plat_reset_handler
  fix(context-mgmt): keep actlr_el2 value in the init context