image_types.bbclass: fix vfat image names

image_types.bbclass: fix vfat image names

Remove the appended ${IMAGE_NAME_SUFFIX}, since it is already included
in ${IMAGE_NAME}.

In commit 26d97acc7137 ("image-artifact-names: include
${IMAGE_NAME_SUFFIX} directly in both ${IMAGE_NAME} and
${IMAGE_LINK_NAME}") ${IMAGE_NAME_SUFFIX} was included into
${IMAGE_NAME}. In this commit all other filesystems in
image_types.bbclass were adapted.

Signed-off-by: Christian Taedcke <christian.taedcke@weidmueller.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>