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This patch also changes semantics: previously failing to set this was interpreted as
a fatal error by enable_flash_ck804 and enable_flash_mcp55 although the output
indicated otherwise. Also, in enable_flash_nvidia_nforce2 there was no check
if settings the bit succeeds.

Now all methods check for success and return ERROR_NONFATAL on failure.

Corresponding to flashrom svn r1592.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>