target: install apk-mbedtls by default
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 <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15543
Signed-off-by: Christian Marangi <[email protected]>
Paul Spooren