hw/cxl: Fix Get LSA input payload size which should be 8 bytes.

Get LSA needs 4 byte offset and 4 byte length arguments.
CXL rev 2.0 Table 178.

Fixes: 3ebe676a ("hw/cxl/device: Implement get/set Label Storage Area (LSA)")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20220817145759.32603-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/cxl/cxl-mailbox-utils.c

@@ -406,7 +406,7 @@ static struct cxl_cmd cxl_cmd_set[256][256] = {
         cmd_identify_memory_device, 0, 0 },
     [CCLS][GET_PARTITION_INFO] = { "CCLS_GET_PARTITION_INFO",
         cmd_ccls_get_partition_info, 0, 0 },
-    [CCLS][GET_LSA] = { "CCLS_GET_LSA", cmd_ccls_get_lsa, 0, 0 },
+    [CCLS][GET_LSA] = { "CCLS_GET_LSA", cmd_ccls_get_lsa, 8, 0 },
     [CCLS][SET_LSA] = { "CCLS_SET_LSA", cmd_ccls_set_lsa,
         ~0, IMMEDIATE_CONFIG_CHANGE | IMMEDIATE_DATA_CHANGE },
 };