refactor(xilinx): move pm_defs.h to common place

Moved pm_defs.h file to common place so that it can be used for
Versal NET and ZynqMP. Also moved common code from zynqmp_pm_defs.h to
common place.

Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
Change-Id: I2ee1e72258c6052cdd6467cdbcf4009afb98da49
diff --git a/plat/xilinx/versal_net/include/plat_private.h b/plat/xilinx/versal_net/include/plat_private.h
index 6a3bc19..fc4a6fd 100644
--- a/plat/xilinx/versal_net/include/plat_private.h
+++ b/plat/xilinx/versal_net/include/plat_private.h
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
  * Copyright (c) 2021-2022, Xilinx, Inc. All rights reserved.
- * Copyright (C) 2022, Advanced Micro Devices, Inc. All rights reserved.
+ * Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -43,7 +43,6 @@
  */
 int request_intr_type_el3(uint32_t irq, interrupt_type_handler_t fiq_handler);
 
-#define PM_GET_CHIPID			(24U)
 #define IOCTL_OSPI_MUX_SELECT		(21U)
 
 #endif /* PLAT_PRIVATE_H */