arm64: mm: Introduce kernel param pbha

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7ZC0H



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Introduce kernel param pbha to control the overall PBHA and PBHA bit0
behavior. If pbha is added in bootarg, PBHA and PBHA bit 0 will be
initialized.

For PBHA bit 0, it accepts the following arg:

  enable: kernel and user will update PBHA bit0 for their pte entry.
  user: only select user task will update PBHA bit0 for pte entry.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>