aarch64: Add system registers for 2024 MPAM extension

This patch adds support for new system registers introduced in the
2024 MPAM extension (Memory Partitioning and Monitoring):

Available in Armv9.3-A:
  MPAMBW0_EL1,
  MPAMBW1_EL1,
  MPAMBW1_EL12,
  MPAMBW2_EL2,
  MPAMBW3_EL3,
  MPAMBWCAP_EL2,
  MPAMBWIDR_EL1

Available in Armv9.3-A with SME:
  MPAMBWSM_EL1

The details can be found in [1].

[1]: https://developer.arm.com/documentation/ddi0601/latest