kexec: allocate vmcoreinfo note buffer on page-size boundary

kexec: allocate vmcoreinfo note buffer on page-size boundary

To satisfy mmap()'s page-size boundary requirement, specify aligned
attribute to vmcoreinfo_note objects to allocate it on page-size boundary.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>