[coreboot] v2 HAVE_OPTION_TABLE patch

[Myles Watson]

This patch makes several CMOS variable reads dependent on whether
there's a table to read.  Otherwise you never know what you'll get
from the factory BIOS.  There are probably more, but these are the
ones compiled into the s2895.

Signed-off-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles
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