Revert "plat/arm: Add support for SEPARATE_NOBITS_REGION"

This reverts commit d433bbdd459c222e5bf5ca87319807465b246d8c.

Change-Id: I46c69dce704a1ce1b50452dd4d62425c4a67f7f0
diff --git a/plat/arm/common/arm_bl31_setup.c b/plat/arm/common/arm_bl31_setup.c
index 7a3ca71..939885f 100644
--- a/plat/arm/common/arm_bl31_setup.c
+++ b/plat/arm/common/arm_bl31_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -56,14 +56,6 @@
 					MT_CODE | MT_SECURE)
 #endif
 
-#if SEPARATE_NOBITS_REGION
-#define MAP_BL31_NOBITS		MAP_REGION_FLAT(			\
-					BL31_NOBITS_BASE,		\
-					BL31_NOBITS_LIMIT 		\
-						- BL31_NOBITS_BASE,	\
-					MT_MEMORY | MT_RW | MT_SECURE)
-
-#endif
 /*******************************************************************************
  * Return a pointer to the 'entry_point_info' structure of the next image for the
  * security state specified. BL33 corresponds to the non-secure image type
@@ -303,9 +295,6 @@
 #if RECLAIM_INIT_CODE
 		MAP_BL_INIT_CODE,
 #endif
-#if SEPARATE_NOBITS_REGION
-		MAP_BL31_NOBITS,
-#endif
 		ARM_MAP_BL_RO,
 #if USE_ROMLIB
 		ARM_MAP_ROMLIB_CODE,