remoteproc: mediatek: Add IMGSYS IPI command

Add an IPI command definition for communication with IMGSYS through
SCP mailbox.

Signed-off-by: Olivia Wen <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mathieu Poirier <[email protected]>

Author: Olivia Wen

include/linux/remoteproc/mtk_scp.h

@@ -43,6 +43,7 @@ enum scp_ipi_id {
 	SCP_IPI_CROS_HOST_CMD,
 	SCP_IPI_VDEC_LAT,
 	SCP_IPI_VDEC_CORE,
+	SCP_IPI_IMGSYS_CMD,
 	SCP_IPI_NS_SERVICE = 0xFF,
 	SCP_IPI_MAX = 0x100,
 };