acpi: Add PPTT support

This patch adds code to generate Processor Properties
Topology Tables (PPTT) compliant to the ACPI 6.4 specification.

 - The 'acpi_get_pptt_topology' hook is mandatory once ACPI_PPTT
 is selected. Its purpose is to return a pointer to a topology tree,
 which describes the relationship between CPUs and caches. The hook
 can be provided by, for example, mainboard code.

Background: We are currently working on mainboard code for qemu-sbsa
and Neoverse N2. Both require a valid PPTT table. Patch was tested
against the qemu-sbsa board.

Change-Id: Ia119e1ba15756704668116bdbc655190ec94ff10
Signed-off-by: David Milosevic <David.Milosevic@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78071
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

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