The deferred page init can help to improve memory initialization at boot
time.

We encountered one memory bandwidth regression in ck-release-17(v4.19.81).
Now, the fix patch for this issue has been backported in v4.19.84. so
enable it again.
Signed-off-by: NShile Zhang <shile.zhang@linux.alibaba.com>
Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>