x86/resctrl: kfree() rmid_ptrs from resctrl_exit()

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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rmid_ptrs[] is allocated from dom_data_init() but never free()d.

While the exit text ends up in the linker script's DISCARD section,
the direction of travel is for resctrl to be/have loadable modules.

Add resctrl_put_mon_l3_config() to cleanup any memory allocated
by rdt_get_mon_l3_config().

There is no reason to backport this to a stable kernel.

Signed-off-by: James Morse <james.morse@arm.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Zeng Heng <zengheng4@huawei.com>