[nrf noup] Remove redefinition ECC_MAX_CURVE_BITS

-This removes the redefinition of the define
 PSA_VENDOR_ECC_MAX_CURVE_BITS which we allow to
 be set in our configuration file from nrf security.

Signed-off-by: Georgios Vasilakis <georgios.vasilakis@nordicsemi.no>

include/psa/crypto_sizes.h

@@ -264,6 +264,7 @@
 
 /* The maximum size of an ECC key on this implementation, in bits.
  * This is a vendor-specific macro. */
+#ifndef PSA_VENDOR_ECC_MAX_CURVE_BITS
 #if defined(PSA_WANT_ECC_SECP_R1_521)           /*!!OM*/
 #define PSA_VENDOR_ECC_MAX_CURVE_BITS 521u
 #elif defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512)
@@ -297,6 +298,7 @@
 #else
 #define PSA_VENDOR_ECC_MAX_CURVE_BITS 0u
 #endif
+#endif
 
 /** This macro returns the maximum supported length of the PSK for the
  * TLS-1.2 PSK-to-MS key derivation