ecdsa: fix -missing-prototypes warning when MBEDTLS_ECDSA_SIGN_ALT is defined

- In `mbedtls/v3.4.0`, ECDSA restartable sign and verify functions (`ecdsa.c`) were made public.
- But the `mbedtls_ecdsa_sign_det_restartable` function prototype was declared in the file `ecdsa.h`,
  only when `MBEDTLS_ECDSA_SIGN_ALT` is not defined.

Signed-off-by: harshal.patil <harshal.patil@espressif.com>
(cherry picked from commit 8c776449065bcffbf013973dd4ef32d580a5cff0)

ChangeLog.d/fix-declaration-of-mbedtls_ecdsa_sign_det_restartable-function.txt

@@ -0,0 +1,5 @@
+Bugfix
+   * Fix declaration of mbedtls_ecdsa_sign_det_restartable() function
+     in the ecdsa.h header file. There was a build warning when the
+     configuration macro MBEDTLS_ECDSA_SIGN_ALT was defined.
+     Resolves #7407.

include/mbedtls/ecdsa.h

@@ -288,6 +288,8 @@ int mbedtls_ecdsa_sign_restartable(
     void *p_rng_blind,
     mbedtls_ecdsa_restart_ctx *rs_ctx);
 
+#endif /* !MBEDTLS_ECDSA_SIGN_ALT */
+
 #if defined(MBEDTLS_ECDSA_DETERMINISTIC)
 
 /**
@@ -321,6 +323,7 @@ int mbedtls_ecdsa_sign_restartable(
  *                      buffer of length \p blen Bytes. It may be \c NULL if
  *                      \p blen is zero.
  * \param blen          The length of \p buf in Bytes.
+ * \param md_alg        The hash algorithm used to hash the original data.
  * \param f_rng_blind   The RNG function used for blinding. This must not be
  *                      \c NULL.
  * \param p_rng_blind   The RNG context to be passed to \p f_rng. This may be
@@ -348,8 +351,6 @@ int mbedtls_ecdsa_sign_det_restartable(
 
 #endif /* MBEDTLS_ECDSA_DETERMINISTIC */
 
-#endif /* !MBEDTLS_ECDSA_SIGN_ALT */
-
 /**
  * \brief           This function verifies the ECDSA signature of a
  *                  previously-hashed message.