[][mt7986: Correct emmc target image name]

[Description]
Fix emmc image name.

[Release-log]
N/A

Change-Id: Ie864a339a42017bb65e67e3bd35a27cc905eabb2
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4977996
diff --git a/target/linux/mediatek/image/mt7986.mk b/target/linux/mediatek/image/mt7986.mk
index 1720a66..87e433c 100644
--- a/target/linux/mediatek/image/mt7986.mk
+++ b/target/linux/mediatek/image/mt7986.mk
@@ -32,7 +32,7 @@
   DEVICE_DTS_DIR := $(DTS_DIR)/mediatek
   DEVICE_PACKAGES := mkf2fs e2fsprogs kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1 kmod-mmc
   IMAGES := sysupgrade-emmc.bin.gz
-  IMAGE/sysupgrade.bin.gz := sysupgrade-emmc | gzip | append-metadata
+  IMAGE/sysupgrade-emmc.bin.gz := sysupgrade-emmc | gzip | append-metadata
 endef
 TARGET_DEVICES += mt7986a-ax6000-emmc-rfb