x86/resctrl: Add CPU online callback for resctrl work

The resctrl architecture specific code may need to create a domain when a CPU
comes online, it also needs to reset the CPUs PQR_ASSOC register.  The resctrl
filesystem code needs to update the rdtgroup_default CPU mask when CPUs are
brought online.

Currently, this is all done in one function, resctrl_online_cpu().  It will
need to be split into architecture and filesystem parts before resctrl can be
moved to /fs/.

Pull the rdtgroup_default update work out as a filesystem specific cpu_online
helper. resctrl_online_cpu() is the obvious name for this, which means the
version in core.c needs renaming.

resctrl_online_cpu() is called by the arch code once it has done the work to
add the new CPU to any domains.

In future patches, resctrl_online_cpu() will take the rdtgroup_mutex itself.

Signed-off-by: James Morse <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Shaopeng Tan <[email protected]>
Reviewed-by: Reinette Chatre <[email protected]>
Reviewed-by: Babu Moger <[email protected]>
Tested-by: Shaopeng Tan <[email protected]>
Tested-by: Peter Newman <[email protected]>
Tested-by: Babu Moger <[email protected]>
Tested-by: Carl Worth <[email protected]> # arm64
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Borislav Petkov (AMD) <[email protected]>

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