x86/microcode: Deprecate MICROCODE_OLD_INTERFACE

This is the ancient loading interface which requires special tools to be
used. The bigger problem with it is that it is as inadequate for proper
loading of microcode as the late microcode loading interface is because
it happens just as late.

iucode_tool's manpage already warns people that it is deprecated.

Deprecate it and turn it off by default along with a big fat warning in
the Kconfig help. It will go away sometime in the future.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Link: https://lkml.kernel.org/r/20190405133010.24249-4-bp@alien8.de

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