decoder: Allow to decode severed extensions

Allow to finish decoding severable sequences (extensions)
suit-dependency-resolution as well as suit-candidate-verification with
SEVERED status.
This case is already allowed for suit-install and suit-payload-fetch
sequences and result in a dedicated error code
(SUIT_ERR_UNAUTHORIZED_COMMAND_SEQ) being returned from
suit_manifest_get_command_seq.

This error code blocks the possibility to fetch or execute the severed
sequence, so a manifest with severed sequence is valid, but execution of
those sequences lead to unrecoverable error.
See #76 and
cc42cf8
for more details.

Ref: NCSDK-29653

Signed-off-by: Tomasz Chyrowicz <[email protected]>

src/suit_decoder.c

@@ -838,22 +838,6 @@ int suit_decoder_decode_sequences(struct suit_decoder_state *state)
 		}
 	}
 
-	if ((state->decoded_manifest->dependency_resolution_seq_status != AUTHENTICATED) &&
-	    (state->decoded_manifest->dependency_resolution_seq_status != UNAVAILABLE)) {
-		state->decoded_manifest->dependency_resolution_seq_status = UNAVAILABLE;
-		if (ret == SUIT_SUCCESS) {
-			ret = SUIT_ERR_MANIFEST_VALIDATION;
-		}
-	}
-
-	if ((state->decoded_manifest->candidate_verification_seq_status != AUTHENTICATED) &&
-	    (state->decoded_manifest->candidate_verification_seq_status != UNAVAILABLE)) {
-		state->decoded_manifest->candidate_verification_seq_status = UNAVAILABLE;
-		if (ret == SUIT_SUCCESS) {
-			ret = SUIT_ERR_MANIFEST_VALIDATION;
-		}
-	}
-
 	if (ret == SUIT_SUCCESS) {
 		state->step = SEQUENCES_DECODED;
 	} else  {