[SPDM 1.3] Request attributes of GET_CERTIFICATE request should not be hard code with zero.

[Zhiqiang520]

Request attributes of GET_CERTIFICATE request should not be hard code with zero.
I think maybe we should add one new parameter Request attributes into libspdm_try_get_certificate() function just like the parameter slot_id.

Refer to the paragraph 382 Table 38 — GET_CERTIFICATE request message format In DSP0274_1.3.0.pdf.

libspdm/library/spdm_requester_lib/libspdm_req_get_certificate.c

Lines 148 to 150 in 743f1db

	spdm_request->header.request_response_code = SPDM_GET_CERTIFICATE;
	spdm_request->header.param1 = slot_id;
	spdm_request->header.param2 = 0;

libspdm/library/spdm_requester_lib/libspdm_req_get_certificate.c

Lines 64 to 71 in 743f1db

	static libspdm_return_t libspdm_try_get_certificate(libspdm_context_t *spdm_context,
	const uint32_t *session_id,
	uint8_t slot_id,
	uint16_t length,
	size_t *cert_chain_size,
	void *cert_chain,
	const void **trust_anchor,
	size_t *trust_anchor_size)

[Zhiqiang520]

This seems a new feature request.