test: shell: GOEP: Optimize TLV-triplet setting

Add a TLV array `tlvs` to keep the pending TLV data.

Update `app_param`, `auth_challenge`, and `auth_rsp` to set the one
TLV information each time. When the optional argument `last` set,
write the all pending TLVs to the tx buffer.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>