
When building with MbedTLS, we are using MbedTLS to decode ASN1 data for x509, pkcs7 and mscode. Introduce _LEGACY and _MBEDTLS kconfigs for ASN1 decoder legacy and MbedTLS implementations respectively. Signed-off-by: Raymond Mao <raymond.mao@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>