ocxl: Initiate a TLB invalidate command

When a TLB Invalidate is required for the Logical Partition, the following
sequence has to be performed:

1. Load MMIO ATSD AVA register with the necessary value, if required.
2. Write the MMIO ATSD launch register to initiate the TLB Invalidate
command.
3. Poll the MMIO ATSD status register to determine when the TLB Invalidate
   has been completed.

Signed-off-by: Christophe Lombard <[email protected]>
Acked-by: Frederic Barrat <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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