The linux-4.14.y backport of commit 286836a7 ("x86/cpu: Add a helper
function x86_read_arch_cap_msr()") added a dependency on cpu.h from
bugs.c so include the header file from bugs.c.

CVE-2019-11135
Suggested-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>