The EDAC shell code previously contained a number of references to the
Intel IBECC driver. Make the shell code more generic to the defined EDAC
API, and make IBECC-specific code dependent on its config option.
Also make NMI control dependent on X86 as it is specific to that
platform.
Rather than looking for a node labeled "ibecc", the EDAC shell code
now simply requires that a chosen entry for "zephyr,edac" be present to
point to the desired device. The Intel Elkhart Lake DTS has been updated
to add this alias.
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
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