since the split of APK in mbedtls and openssl version, installing `apk`
as default package doesn't do the trick anymore. Instead specify
`apk-mbedtls` directly.
Signed-off-by: Paul Spooren <mail@aparcar.org>
Link: https://github.com/openwrt/openwrt/pull/15543
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>