arm_mpam: resctrl: Add empty definitions for fine-grained enables

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 individual hooks to separately enable and disable the
closid/partid and rmid/pmg context switching code.

For MPAM this is all the same thing, as the value in struct task_struct
is used to cache the value that should be written to hardware.
arm64's context switching code is enabled once MPAM is usable, but
doesn't touch the hardware unless the value has changed.

Resctrl doesn't need to ask. Add empty definitions for these hoooks.

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