mm-page_allocc-introduce-kernelcore=mirror-option-fix

mm-page_allocc-introduce-kernelcore=mirror-option-fix

fix build with CONFIG_HAVE_MEMBLOCK_NODE_MAP=n

Reported-by: Sudeep Holla <sudeep.holla@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Taku Izumi <izumi.taku@jp.fujitsu.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>