platform/x86/intel/pmc/ssram: Switch to static array with per-index probe state

Replace devm-allocated pmc_ssram_telems pointer with a fixed-size static
array and introduce per-index probe state tracking.

This prepares the driver for later per-device probe handling where tying
the PMC tracking storage to one probed PCI device is no longer suitable.

The previous single global device_probed flag cannot describe the state of
individual PMC indices when multiple devices can be probed independently.
Replace it with per-index state (UNPROBED, PROBING, PRESENT, ABSENT) and a
staging cache that publishes discovered values only after probe completes.
This avoids races between probe/unbind and concurrent readers.

Use marked state accesses with release/acquire ordering to prevent compiler
and CPU reordering issues across concurrent probe/unbind cycles.

This patch was substantially rewritten in later revisions. Originally
developed from earlier work by Xi Pardee.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Assisted-by: Claude:claude-sonnet-4-5
Link: https://patch.msgid.link/a2cccf532bec04fcc370819890d936212bc1b14c.1781294741.git.david.e.box@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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