arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/snapshot/v6.7-rc2



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resctrl has its own data structures to describe its resources. We
can't use these directly as we play tricks with the 'MBA' resource,
picking the MPAM controls or monitors that best apply. We may export
the same component as both L3 and MBA.

Add mpam_resctrl_exports[] as the array of class->resctrl mappings we
are exporting, and add the cpuhp hooks that allocated and free the
resctrl domain structures.

While we're here, plumb in a few other obvious things.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Zeng Heng <zengheng4@huawei.com>