ACPI: APEI: EINJ: Create debugfs files to enter device id and syndrome

ACPI: APEI: EINJ: Create debugfs files to enter device id and syndrome

EINJv2 allows users to inject multiple errors at the same time by
specifying the device id and syndrome bits for each error in a flex
array.

Create files in the einj debugfs directory to enter data for each
device id and syndrome value. Note that the specification says these
are 128-bit little-endian values. Linux doesn't have a handy helper
to manage objects of this type.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Zaid Alali <zaidal@os.amperecomputing.com>
Link: https://patch.msgid.link/20250617193026.637510-6-zaidal@os.amperecomputing.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>