ACPI: APEI: EINJ: Discover EINJv2 parameters

The EINJv2 set_error_type_with_address structure has a flex array
to hold the component IDs and syndrome values used when injecting
multiple errors at once.

Discover the size of this array by taking the address from the
ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS entry in the EINJ table
and reading the BIOS copy of the structure.

Derive the maximum number of components from the length field
in the einjv2_extension_struct at the end of the BIOS copy.

Map the whole of the structure into kernel memory (and unmap
on module unload).

[Tony: Code unchanged from Zaid's original. New commit message]

Reviewed-by: Tony Luck <[email protected]>
Reviewed-by: Ira Weiny <[email protected]>
Signed-off-by: Zaid Alali <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Rafael J. Wysocki <[email protected]>

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