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The microcode revision is already readable for non-root users via
/proc/cpuinfo. Thus, there's no reason to keep the same information
readable by root only in /sys/devices/system/cpu/cpuX/microcode/.

Make .../processor_flags world-readable too, while at it.
Reported-by: Tim Burgess <timb@dug.com>
Signed-off-by: Jacek Tomaka <jacek.tomaka@poczta.fm>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180825035039.14409-1-jacekt@dugeo.com