x86/bugs: Fix the parameters alignment and missing void

x86/bugs: Fix the parameters alignment and missing void

Fixes: 7bb4d366c ("x86/bugs: Make cpu_show_common() static")
Fixes: 24f7fc83b ("x86/bugs: Provide boot parameters for the spec_store_bypass_disable mitigation")
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
CVE-2018-3639 (x86)

(backported from commit ffed645e3be0e32f8e9ab068d257aee8d0fe8eec)
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>