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feat(PMA, CSR): support PMA Custom CSR configurable #801

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  • We implements 16 PMA entries, all PMA CSR fields are WARL and may be read-only zero.

  • That means that accessing CSRs of implemented PMA entries should not rasie illegal instruction exception.

  • We adds initial configuration of PMA custom CSRs, and adds CSR reading and writing of PMA custom registers.

  • NOTE: This patch adds some key config of PMA in Kconfig.

* We implements 16 PMA entries, all PMA CSR fields are WARL
  and may be read-only zero.

* That means that accessing CSRs of implemented PMA entries
  should not rasie illegal instruction exception.

* We adds initial configuration of PMA custom CSRs,
  and adds CSR reading and writing of PMA custom registers.

* NOTE: This patch adds some key config of PMA in Kconfig.
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