drivers: crypto: mbedtls: Remove dead code

mtls_session_setup checks early if the given mode is valid and return
an error if not. CRYPTO_CIPHER_MODE_CTR is not a valid one so there is
no needed to have it in the switch.

CID: 20600

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
1 file changed