crypto: ecc - delete a useless function declaration

This function declaration has been added in 'ecc_curve.h',
delete it in 'crypto/ecc.h'.

Fixes: 4e6602916bc6(crypto: ecdsa - Add support for ECDSA ...)
Signed-off-by: Meng Yu <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

crypto/ecc.h

···
 }
 
 /**
- * ecc_get_curve()  - Get a curve given its curve_id
- * @curve_id:  Id of the curve
- *
- * Returns pointer to the curve data, NULL if curve is not available
- */
-const struct ecc_curve *ecc_get_curve(unsigned int curve_id);
-
-/**
  * ecc_is_key_valid() - Validate a given ECDH private key
  *
  * @curve_id:		id representing the curve to use