[nrf toup] [Crypto] Stop compiling legacy SPAKE2P if PSA is available

If the CHIP_CRYPTO_PSA_SPAKE2P is enabled the build system should
not compile Legacy Spake2p implementation, because the PSA one
is available in the PSASpake2p.cpp file.

src/crypto/CHIPCryptoPALPSA.cpp

@@ -761,6 +761,9 @@ CHIP_ERROR P256Keypair::NewCertificateSigningRequest(uint8_t * out_csr, size_t &
     return CHIP_NO_ERROR;
 }
 
+// We should compile this SPAKE2P implementation only if the PSA implementation is not in use.
+#if !CHIP_CRYPTO_PSA_SPAKE2P
+
 typedef struct Spake2p_Context
 {
     mbedtls_ecp_group curve;
@@ -1066,5 +1069,7 @@ CHIP_ERROR Spake2p_P256_SHA256_HKDF_HMAC::PointIsValid(void * R)
     return CHIP_NO_ERROR;
 }
 
+#endif // !CHIP_CRYPTO_PSA_SPAKE2P
+
 } // namespace Crypto
 } // namespace chip