image: Define 1st, cert-sw and ape-algo Harmattan images

This change allows 0xFFFF to unpack Harmattan fiasco images.

src/image.h

@@ -37,6 +37,9 @@ enum image_type {
 	IMAGE_CMT_2ND,
 	IMAGE_CMT_ALGO,
 	IMAGE_CMT_MCUSW,
+	IMAGE_1ST,
+	IMAGE_CERT_SW,
+	IMAGE_APE_ALGO,
 	IMAGE_COUNT,
 };