mbedtls: Remove Kconfig options removed from mbedtls 3.6.0

mbedtls: Remove Kconfig options removed from mbedtls 3.6.0

These options are not available in mbedtls 3.6.0 and selecting them
causes an error.

MBEDTLS_CERTS_C was removed in:
https://github.com/Mbed-TLS/mbedtls/commit/1aec64642cd0b9490c96fdd1fa9816741d93fce4

MBEDTLS_XTEA_C was removed in:
https://github.com/Mbed-TLS/mbedtls/commit/10e8cf5fef7e062927bfbec69ad85fbf491b4299

MBEDTLS_SSL_TRUNCATED_HMAC was removed in:
https://github.com/Mbed-TLS/mbedtls/commit/4a7010d1aaae937dfa328ef253d70d04b3b260ff

Fixes: 0e0664264386 ("mbedtls: Update to version 3.6.0")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>