image: add new "copro" image type

Define new image type for coprocessor images.
It is used in FIT to identify the files loaded
with remoteproc command (elf or bin).

Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/image.h b/include/image.h
index 404b733..c1065c0 100644
--- a/include/image.h
+++ b/include/image.h
@@ -284,6 +284,7 @@
 	IH_TYPE_MTKIMAGE,		/* MediaTek BootROM loadable Image */
 	IH_TYPE_IMX8MIMAGE,		/* Freescale IMX8MBoot Image	*/
 	IH_TYPE_IMX8IMAGE,		/* Freescale IMX8Boot Image	*/
+	IH_TYPE_COPRO,			/* Coprocessor Image for remoteproc*/
 
 	IH_TYPE_COUNT,			/* Number of image types */
 };