Platform/ARM/Morello: Fix SMBIOS Type 3 (System Enclosure) length

The SMBIOS header for this table was initialised with the wrong table's
size, which was 3 bytes greater than the correct value. As a result,
the first three characters from the strings, the "ARM" in "ARM LTD" for
the chassis manufacturer, are erroneously attributed to the table and
so parsers interpret the manufacturer as " LTD".
11 jobs for !22 with fix-chassis-manufacturer in 2 minutes and 38 seconds (queued for 1 second)
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