[coreboot] [PATCH]kconfig cleanup (failover config flags)

[Patrick Georgi]

Hi,

attached patch moves the failover configuration symbols to a global
file, defined as bool, defaulting to false.
Given that Kconfig doesn't support failover, there hardly will be a
reason to enable it, and if there is, they can still be enabled as
needed.

Signed-off-by: Patrick Georgi