In order to support the legacy SCPI protocol variant, add back the structures
and macros that varies against the final specification.

Signed-off-by: Neil Armstrong <redacted>
---
I checked against Amlogic implementation documentation and on-device, the channel selection
via legacy_scpi_get_chan() is needed and fails without it.
The sender_id is not needed so it was dropped.

 drivers/firmware/arm_scpi.c | 84 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c
index 403783a..0bb6134 100644
--- a/drivers/firmware/arm_scpi.c
+++ b/drivers/firmware/arm_scpi.c

@@ -183,6 +224,11 @@ struct scpi_shared_mem {
 	u8 payload[0];
 } __packed;

+struct legacy_scpi_shared_mem {
+	__le32 status;
+	u8 payload[0];
+} __packed;
+
 struct scp_capabilities {
 	__le32 protocol_version;
 	__le32 event_version;

@@ -208,6 +254,12 @@ struct clk_set_value {
 	__le32 rate;
 } __packed;

+struct legacy_clk_set_value {
+	__le32 rate;
+	__le16 id;
+	__le16 reserved;
+} __packed;
+
 struct dvfs_info {
 	__le32 header;
 	struct {

@@ -237,6 +289,10 @@ struct sensor_value {
 	__le32 hi_val;
 } __packed;

+struct legacy_sensor_value {
+	__le32 val;
+} __packed;
+