configs: enable deferred page init

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>

config-4.19.y-x86_64

@@ -946,7 +946,7 @@ CONFIG_ZSMALLOC=m
 # CONFIG_PGTABLE_MAPPING is not set
 # CONFIG_ZSMALLOC_STAT is not set
 CONFIG_GENERIC_EARLY_IOREMAP=y
-# CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set
+CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
 # CONFIG_IDLE_PAGE_TRACKING is not set
 CONFIG_ARCH_HAS_ZONE_DEVICE=y
 CONFIG_ZONE_DEVICE=y

config-4.19.y-x86_64-debug

@@ -946,7 +946,7 @@ CONFIG_ZSMALLOC=m
 # CONFIG_PGTABLE_MAPPING is not set
 # CONFIG_ZSMALLOC_STAT is not set
 CONFIG_GENERIC_EARLY_IOREMAP=y
-# CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set
+CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
 # CONFIG_IDLE_PAGE_TRACKING is not set
 CONFIG_ARCH_HAS_ZONE_DEVICE=y
 CONFIG_ZONE_DEVICE=y