Backport fsi: occ: Use PutOCCSRAM in circular mode for OCC attention

We can't do SCOMs from the BMC when the host is booted in secure mode,
and without triggering the attention of the OCC our commands won't be
processed. Further, the SCOM operation fails, which causes the OCC
driver's probe to fail, which leads the BMC to think that the OCC has
failed.

We have an alternative to the SCOM though: We can trigger the OCC by
writing the correct attention magic in circular buffer mode.

The PutOCCSRAM operation returns the written data length in the response
payload before the 0xCODE word, so the condition testing the success of
the operation is rearranged.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
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