bootutil: Remove P224 curve

Signed-off-by: Roland Mikhel <roland.mikhel@arm.com>
Change-Id: I49fad7ede202de4e3c710bf4aa1df195a310b037
diff --git a/boot/bootutil/src/caps.c b/boot/bootutil/src/caps.c
index f44ab02..63bcd64 100644
--- a/boot/bootutil/src/caps.c
+++ b/boot/bootutil/src/caps.c
@@ -2,7 +2,7 @@
  * SPDX-License-Identifier: Apache-2.0
  *
  * Copyright (c) 2017 Linaro Limited
- * Copyright (c) 2021 Arm Limited
+ * Copyright (c) 2021-2023 Arm Limited
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,9 +32,6 @@
     res |= BOOTUTIL_CAP_RSA3072;
 #endif
 #endif
-#if defined(MCUBOOT_SIGN_EC)
-    res |= BOOTUTIL_CAP_ECDSA_P224;
-#endif
 #if defined(MCUBOOT_SIGN_EC256)
     res |= BOOTUTIL_CAP_ECDSA_P256;
 #endif