feat(imx8m): add the anamix pll override setting

Add PLL power down override & bypass support when
system enter DSM mode.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: I50cd6b82151961ab849f58714a8c307d3f7f4166
diff --git a/plat/imx/imx8m/include/gpc.h b/plat/imx/imx8m/include/gpc.h
index 29b8ecf..16129d1 100644
--- a/plat/imx/imx8m/include/gpc.h
+++ b/plat/imx/imx8m/include/gpc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -69,5 +69,6 @@
 void imx_set_sys_lpm(unsigned last_core, bool retention);
 void imx_set_rbc_count(void);
 void imx_clear_rbc_count(void);
+void imx_anamix_override(bool enter);
 
 #endif /*IMX8M_GPC_H */