imx: imx8qm: add domain off support

Add domain off support for Linux kernel's cpu
hot-plug feature, when there are cpu off request
from Linux kernel, TF-A will send command to
system controller to do CPU power gate accordingly,
tested on i.MX8QM MEK board.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
diff --git a/plat/imx/imx8qx/include/platform_def.h b/plat/imx/imx8qx/include/platform_def.h
index 2cd1400..8c86174 100644
--- a/plat/imx/imx8qx/include/platform_def.h
+++ b/plat/imx/imx8qx/include/platform_def.h
@@ -17,6 +17,8 @@
 #define PLATFORM_MAX_CPU_PER_CLUSTER	4
 #define PLATFORM_CLUSTER_COUNT		1
 #define PLATFORM_CORE_COUNT		4
+#define PLATFORM_CLUSTER0_CORE_COUNT	4
+#define PLATFORM_CLUSTER1_CORE_COUNT	0
 
 #define PWR_DOMAIN_AT_MAX_LVL           1
 #define PLAT_MAX_PWR_LVL                2