x86/resctrl: Allocate the cleanest CLOSID by searching closid_num_dirty_rmid

MPAM's PMG bits extend its PARTID space, meaning the same PMG value can be used
for different control groups.

This means once a CLOSID is allocated, all its monitoring ids may still be
dirty, and held in limbo.

Instead of allocating the first free CLOSID, on architectures where
CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID is enabled, search
closid_num_dirty_rmid[] to find the cleanest CLOSID.

The CLOSID found is returned to closid_alloc() for the free list
to be updated.

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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