mesh: Fixes Relay to frnd_cred message
mesh: Fixes Relay to frnd_cred message

If low power node publish with unicast address other
than friend address, the friend node should relayed
this message to all network interface.

When Proxy feature enabled, message from gatt bearer should
relay to adv bearer even relay feature disabled.

this is port of 1e9bd13c99f5721c96f62f7b01aa682c4b0dac11

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble