image: rename image-wic -> image_types_wic

Make name of the wic image type class consistent with
existing naming scheme for image types.

(From OE-Core rev: 4aab1b77d5f9403cbb3fae790069ef54821491fb)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/image.bbclass

@@ -151,6 +151,9 @@ def build_uboot(d):
 IMAGE_TYPE_uboot = "${@build_uboot(d)}"
 inherit ${IMAGE_TYPE_uboot}
 
+IMAGE_TYPE_wic = "image_types_wic"
+inherit ${IMAGE_TYPE_wic}
+
 python () {
     deps = " " + imagetypes_getdepends(d)
     d.appendVarFlag('do_rootfs', 'depends', deps)
@@ -187,8 +190,6 @@ python () {
 IMAGE_CLASSES += "image_types"
 inherit ${IMAGE_CLASSES}
 
-inherit image-wic
-
 IMAGE_POSTPROCESS_COMMAND ?= ""
 
 # some default locales