ath79: add missing IMAGE_SIZE for Comfast WR650AC v1/v2

When adding support in 9ed272fe9500 ("ath79: add support for
Comfast WR650AC v1/v2"), IMAGE_SIZE has not been added to device
definition.

Signed-off-by: Adrian Schmutzler <[email protected]>

target/linux/ath79/image/generic.mk

@@ -282,6 +282,7 @@ define Device/comfast_cf-wr650ac-v1
   DEVICE_MODEL := CF-WR650AC
   DEVICE_VARIANT := v1
   DEVICE_PACKAGES := kmod-ath10k-ct ath10k-firmware-qca988x-ct
+  IMAGE_SIZE := 16128k
 endef
 TARGET_DEVICES += comfast_cf-wr650ac-v1
 
@@ -291,6 +292,7 @@ define Device/comfast_cf-wr650ac-v2
   DEVICE_MODEL := CF-WR650AC
   DEVICE_VARIANT := v2
   DEVICE_PACKAGES := kmod-ath10k-ct ath10k-firmware-qca988x-ct
+  IMAGE_SIZE := 16000k
 endef
 TARGET_DEVICES += comfast_cf-wr650ac-v2