Tegra: Break circular dependency in platform header files

For SoCs T132 and T210, the header file 'platform_def.h' used to include
'tegra_def.h' and vice versa. This patch breaks this circular dependency
by making 'tegra_def.h' independent.

Change-Id: I45a00a84e6ab8b93d5e9242a9ff65f03e9102a96
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>

plat/nvidia/tegra/include/t132/tegra_def.h

@@ -7,8 +7,6 @@
 #ifndef __TEGRA_DEF_H__
 #define __TEGRA_DEF_H__
 
-#include <platform_def.h>
-
 /*******************************************************************************
  * This value is used by the PSCI implementation during the `SYSTEM_SUSPEND`
  * call as the `state-id` field in the 'power state' parameter.

plat/nvidia/tegra/include/t210/tegra_def.h

@@ -7,8 +7,6 @@
 #ifndef __TEGRA_DEF_H__
 #define __TEGRA_DEF_H__
 
-#include <platform_def.h>
-
 /*******************************************************************************
  * Power down state IDs
  ******************************************************************************/