sim: Add cap for SUIT support

Detect MCUboot configured for SUIT support.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/boot/bootutil/src/caps.c b/boot/bootutil/src/caps.c
index 85bd6fd..5c3bca2 100644
--- a/boot/bootutil/src/caps.c
+++ b/boot/bootutil/src/caps.c
@@ -44,6 +44,9 @@
 #if defined(MCUBOOT_VALIDATE_SLOT0)
 	res |= BOOTUTIL_CAP_VALIDATE_SLOT0;
 #endif
+#if defined(MCUBOOT_SUIT)
+	res |= BOOTUTIL_CAP_SUIT;
+#endif
 
         return res;
 }