fix #27418285

We introduce a boot parametter 'deferred_meminit' for defer
page init feature. Default it is disabled, and we can pass
'deferred_meminit' to enable it.
Signed-off-by: Nchenxiangzuo <cxz18821786681@linux.alibaba.com>
Reviewed-by: NXu Yu <xuyu@linux.alibaba.com>
Reviewed-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NShile Zhang <shile.zhang@linux.alibaba.com>