nfp: dump rtsyms

- Support rtsym TLVs.
- If specified rtsym is not found, dump the spec TLV as -ENOENT error.

Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>