x86/bugs: Concentrate bug reporting into a separate function

x86/bugs: Concentrate bug reporting into a separate function

Those SysFS functions have a similar preamble, as such make common
code to handle them.

OraBug: 28041771
CVE: CVE-2018-3639

Suggested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
(cherry picked from commit d1059518b4789cabe34bb4b714d07e6089c82ca1)
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Mihai Carabas <mihai.carabas@oracle.com>
 Conflicts:
	arch/x86/kernel/cpu/bugs.c

[As it does not exist in UEK4. It is called bugs_64.c]

Signed-off-by: Brian Maly <brian.maly@oracle.com>