configfs-tsm-report: Document size limits for outblob attributes

The configfs-tsm-report interface can fail with -EFBIG when the
attestation report generated by a TSM provider exceeds internal
maximums (TSM_REPORT_OUTBLOB_MAX). However, this error condition and
its handling are not currently documented in the ABI.

Userspace tools need to understand how to interpret various error
conditions when reading attestation reports.

Document that reads fail with -EFBIG when reports exceed size limits,
with guidance on how to resolve them.

Reviewed-by: Fang Peter <peter.fang@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Link: https://patch.msgid.link/20260211001712.1531955-2-sathyanarayanan.kuppuswamy@linux.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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