x86/microcode: Make revision and processor flags world-readable

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

arch/x86/kernel/cpu/microcode/core.c

@@ -666,8 +666,8 @@ static ssize_t pf_show(struct device *dev,
 }
 
 static DEVICE_ATTR_WO(reload);
-static DEVICE_ATTR(version, 0400, version_show, NULL);
-static DEVICE_ATTR(processor_flags, 0400, pf_show, NULL);
+static DEVICE_ATTR(version, 0444, version_show, NULL);
+static DEVICE_ATTR(processor_flags, 0444, pf_show, NULL);
 
 static struct attribute *mc_default_attrs[] = {
 	&dev_attr_version.attr,