cxl/pci: Introduce cxl_decode_register_block()

Each register block located in the DVSEC needs to be decoded from 2
words, 'register offset high' and 'register offset low'.

Create a function, cxl_decode_register_block() to perform this decode
and return the bar, offset, and register type of the register block.

Then use the values decoded in cxl_mem_map_regblock() instead of passing
the raw registers.

Signed-off-by: Ira Weiny <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dan Williams <[email protected]>

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