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This ensures that the ToC presented to the host indicates that it is not
writable. The virtual PNOR implementation has never properly honoured
writes to the ToC, so lets at least tell the host.

As the code has not yet been fixed to implement the desired behaviour,
add the test to XFAIL_TESTS.

Change-Id: Ia13a0f907f916d6dec3979b17685d54bc578a106
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>