cxl/pci: Map RCH downstream AER registers for logging protocol errors

The restricted CXL host (RCH) error handler will log protocol errors
using AER and RAS status registers. The AER and RAS registers need to
be virtually memory mapped before enabling interrupts. Create the
initializer function devm_cxl_setup_parent_dport() for this when the
endpoint is connected with the dport. The initialization sets up the
RCH RAS and AER mappings.

Add 'struct cxl_regs' to 'struct cxl_dport' for saving a pointer to
the RCH downstream port's AER and RAS registers.

Signed-off-by: Terry Bowman <[email protected]>
Co-developed-by: Robert Richter <[email protected]>
Signed-off-by: Robert Richter <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dan Williams <[email protected]>

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