libwebsockets can be built without TLS support. To allow this, it
was necessary to create a specific Kconfig option that enables TLS
support if OPENSSL_MBEDTLS_WRAPPER is enabled. Otherwise, TLS is
not supported (but libwebsockets can still be used with plain ws://
connections).
Signed-off-by: Tiago Medicci <tiago.medicci@espressif.com>