[][Add and enable mt7981 linux cpu hotplug support]

[Description]
Add and enable mt7981 linux cpu hotplug support

[Release-log]
N/A

Change-Id: I0b44de7dfd19538fd72f4ffdf620e443a7615f4f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5305910
diff --git a/target/linux/mediatek/mt7981/config-5.4 b/target/linux/mediatek/mt7981/config-5.4
index 3bb9ed5..685e871 100644
--- a/target/linux/mediatek/mt7981/config-5.4
+++ b/target/linux/mediatek/mt7981/config-5.4
@@ -186,6 +186,7 @@
 CONFIG_GENERIC_GETTIMEOFDAY=y
 CONFIG_GENERIC_IDLE_POLL_SETUP=y
 CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK=y
+CONFIG_GENERIC_IRQ_MIGRATION=y
 CONFIG_GENERIC_IRQ_MULTI_HANDLER=y
 CONFIG_GENERIC_IRQ_SHOW=y
 CONFIG_GENERIC_IRQ_SHOW_LEVEL=y
@@ -212,6 +213,7 @@
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT_MAP=y
 CONFIG_HOLES_IN_ZONE=y
+CONFIG_HOTPLUG_CPU=y
 # CONFIG_HW_NAT is not set
 CONFIG_HW_RANDOM=y
 CONFIG_HW_RANDOM_MTK=y