samples/drivers/crypto: CBC and CTR mode not supported

[cinlyooi-intel]

Describe the bug
CBC and CTR mode not supported for test case sample.driver.crypto.mbedtls only. (It works for sample.driver.crypto.mbedtls.micro)

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -DBOARD=nrf52_pca10040 # qemu_x86, qemu_nios2, qemu_arm, arduino_due, frdm_k64f, nrf51_pca10028, sam_e70_xplained, nrf52840_pca10056, altera_max10, quark_ss_c1000_devboard:x86, quark_ss_c1000_se_devboard:arc
3. make
4. make run

Screenshots or console output

****** delaying boot 1000ms (per build configuration) *****
***** Booting Zephyr OS v1.14.0-rc3-104-g4aa48833d812 (delayed boot 1000ms) *****
[00:00:01.011,840] <inf> main: Cipher Sample
[00:00:01.011,840] <inf> main: CBC Mode
[00:00:01.011,840] <err> mbedtls: Unsupported mode
[00:00:01.011,840] <inf> main: CTR Mode
[00:00:01.011,871] <err> mbedtls: Unsupported mode
[00:00:01.011,871] <inf> main: CCM Mode
[00:00:01.012,145] <inf> main: Output length (encryption): 31
[00:00:01.012,145] <inf> main: CCM mode ENCRYPT - Match
[00:00:01.012,451] <inf> main: Output length (decryption): 31
[00:00:01.012,451] <inf> main: CCM mode DECRYPT - Match

Environment (please complete the following information):

• OS: fedora29
• Toolchain zephyr
• Commit SHA or Version used: 4aa4883

[ghost]

This appears to be the expected behavior. From crypto_mtls_shim.c:

        if (mode != CRYPTO_CIPHER_MODE_CCM) {
                LOG_ERR("Unsupported mode");
                return -EINVAL;
        }

In addition, the test case doesn't need to be modified because it's not failing: it doesn't look for successful crypto, just to see if it attempts the crypto. So I'm going to close this as a false alarm.