kirkwood: add kmod-hwmon-core to DEVICE_PACKAGES

kmod-hwmon-lm* will not get into images unless kmod-hwmon-core is added to
DEVICE_PACKAGES as well.

Signed-off-by: Sungbo Eo <mans0n@gorani.run>
[only address kmod-hwmon-core in this commit]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/kirkwood/image/Makefile

@@ -66,7 +66,8 @@ define Device/iom_ix2-200
   DEVICE_VENDOR := Iomega
   DEVICE_MODEL := StorCenter ix2-200
   DEVICE_DTS := kirkwood-iomega_ix2_200
-  DEVICE_PACKAGES += kmod-gpio-button-hotplug kmod-i2c-mv64xxx kmod-hwmon-lm63
+  DEVICE_PACKAGES := kmod-gpio-button-hotplug kmod-i2c-mv64xxx kmod-hwmon-core \
+	kmod-hwmon-lm63
   DEVICE_TYPE:=nas
   PAGESIZE := 512
   SUBPAGESIZE := 256
@@ -138,7 +139,8 @@ TARGET_DEVICES += seagate_goflexhome
 define Device/zyxel_nsa310b
   DEVICE_VENDOR := ZyXEL
   DEVICE_MODEL := NSA310b
-  DEVICE_PACKAGES := kmod-r8169 kmod-gpio-button-hotplug kmod-hwmon-lm85
+  DEVICE_PACKAGES := kmod-r8169 kmod-gpio-button-hotplug kmod-hwmon-core \
+	kmod-hwmon-lm85
   BOARD_NAME := nsa310b
 endef
 TARGET_DEVICES += zyxel_nsa310b