Merge changes from topic "hikey960-el3-spmc" into integration

* changes:
  feat(hikey960): read serial number from UFS
  feat(hikey960): add a FF-A logical partition
  feat(hikey960): add memory sharing hooks for SPMC_AT_EL3
  feat(hikey960): add plat-defines for SPMC_AT_EL3
  feat(hikey960): define a datastore for SPMC_AT_EL3
  feat(hikey960): add SP manifest for SPMC_AT_EL3
  feat(hikey960): increase secure workspace to 64MB
  feat(hikey960): upgrade to xlat_tables_v2