Fix use-after-free in the FreeRTOS mDNS backend

[d-serj]

Issue:
When an mdns search finished, the FreeRTOS backend passed its own found_entries vector straight to the on_entries_found callback. But that callback takes ownership: it processes entries and frees the vector. So the mdns backend kept using a vector that had already been freed.

Fix:
Add MdnsNotifyFoundEntries() which copies the entries into a new vector and passes that to the ship_node callback (the same approach used in ship_mdns_bonjour.c)

Other updates:
Remove unused include from src/ship/mdns/ship_mdns_bonjour.c
Fix FreeRTOS.h include in src/common/eebus_malloc.h

[mansandersson]

Thank you for your contribution