arm_mpam: Add the class and component structures for ris firmware described

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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An MSC is a container of resources, each identified by their RIS index.
Some RIS are described by firmware to provide their position in the system.
Others are discovered when the driver probes the hardware.

To configure a resource it needs to be found by its class, e.g. 'L2'.
There are two kinds of grouping, a class is a set of components, which
are visible as there are likely to be multiple instances of the L2 cache.
struct mpam_components are a set of struct mpam_msc_ris, which are not
visible as each L2 cache may be composed of individual slices which need
to be configured the same as the hardware is not able to distribute the
configuration.

Add support for creating and destroying these structures.
A gfp is passed as the structure for 'unknown' may need creating
if a new RIS entry is discovered when probing the MSC.

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