Merge changes from topic "feat_state_part4" into integration

* changes:
  refactor(cpufeat): enable FEAT_RNG for FEAT_STATE_CHECKED
  refactor(cpufeat): align FEAT_SEL2 to new feature handling
  refactor(cpufeat): enable FEAT_NV2 for FEAT_STATE_CHECKED
  refactor(cpufeat): enable FEAT_TWED for FEAT_STATE_CHECKED
  refactor(cpufeat): enable FEAT_CSV2_2 for FEAT_STATE_CHECKED
  refactor(cpufeat): enable FEAT_ECV for FEAT_STATE_CHECKED
  refactor(cpufeat): enable FEAT_PAN for FEAT_STATE_CHECKED
  refactor(cpufeat): align FEAT_SB to new feature handling
  refactor(cpufeat): use alternative encoding for "SB" barrier
  refactor(cpufeat): enable SYS_REG_TRACE for FEAT_STATE_CHECKED
  fix(cpufeat): make stub enable functions "static inline"
  fix(mpam): feat_detect: support major/minor

diff --cc Makefile
Simple merge

diff --cc plat/arm/board/fvp/platform.mk
Simple merge

diff --cc plat/qemu/qemu/platform.mk
Simple merge