image: Eliminate IMAGE_ENABLE_VERIFY_ECDSA macro

This macro is no longer needed for code flow or #ifdefs. Remove it.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/image.h b/include/image.h
index 64663c5..e20f0b6 100644
--- a/include/image.h
+++ b/include/image.h
@@ -1196,17 +1196,14 @@
 #if defined(USE_HOSTCC)
 # if defined(CONFIG_FIT_SIGNATURE)
 #  define IMAGE_ENABLE_SIGN	1
-#  define IMAGE_ENABLE_VERIFY_ECDSA	1
 #  define FIT_IMAGE_ENABLE_VERIFY	1
 #  include <openssl/evp.h>
 # else
 #  define IMAGE_ENABLE_SIGN	0
-# define IMAGE_ENABLE_VERIFY_ECDSA	0
 #  define FIT_IMAGE_ENABLE_VERIFY	0
 # endif
 #else
 # define IMAGE_ENABLE_SIGN	0
-# define IMAGE_ENABLE_VERIFY_ECDSA	0
 # define FIT_IMAGE_ENABLE_VERIFY	CONFIG_IS_ENABLED(FIT_SIGNATURE)
 #endif