cxl/pci: Move tracepoint definitions to drivers/cxl/core/

CXL is using tracepoints for reporting RAS capability register payloads
for AER events, and has plans to use tracepoints for the output payload
of Get Poison List and Get Event Records commands. For organization
purposes it would be nice to keep those all under a single + local CXL
trace system. This also organization also potentially helps in the
future when CXL drivers expand beyond generic memory expanders, however
that would also entail a move away from the expander-specific
cxl_dev_state context, save that for later.

Note that the powerpc-specific drivers/misc/cxl/ also defines a 'cxl'
trace system, however, it is unlikely that a single platform will ever
load both drivers simultaneously.

Cc: Steven Rostedt <[email protected]>
Tested-by: Alison Schofield <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Link: https://lore.kernel.org/r/167051869176.436579.9728373544811641087.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <[email protected]>

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