mvebu: remove redefinition of image name for clearfog

The IMAGE_NAME redefinition causes overwriting of generated SD card
image when multiple root file system types are selected. In result only
single SD card image is generated. This commit fixes this behaviour.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

target/linux/mvebu/image/Makefile

@@ -201,7 +201,6 @@ define Device/armada-388-clearfog-pro
   DEVICE_PACKAGES := mkf2fs e2fsprogs swconfig kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1
   IMAGES := sdcard.img.gz
   IMAGE/sdcard.img.gz := boot-scr-cfpro | boot-img | sdcard-img | gzip | append-metadata
-  IMAGE_NAME = $$(IMAGE_PREFIX)-$$(2)
   DEVICE_DTS := armada-388-clearfog-pro armada-388-clearfog-base
   SUPPORTED_DEVICES := armada-388-clearfog-pro armada-388-clearfog
 endef
@@ -214,7 +213,6 @@ define Device/armada-388-clearfog-base
   DEVICE_PACKAGES := mkf2fs e2fsprogs kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1
   IMAGES := sdcard.img.gz
   IMAGE/sdcard.img.gz := boot-scr-cfbase | boot-img | sdcard-img | gzip | append-metadata
-  IMAGE_NAME = $$(IMAGE_PREFIX)-$$(2)
   DEVICE_DTS := armada-388-clearfog-pro armada-388-clearfog-base
 endef
 TARGET_DEVICES += armada-388-clearfog-base