refactor(plat/arm): rename ARM_DTB_DRAM_NS region macros

The macros PLAT_HW_CONFIG_DTB_BASE and PLAT_HW_CONFIG_DTB_SIZE
describe the range of memory where the HW_CONFIG_DTB can be loaded
rather than the actual load address and size of the DTB. This patch
changes the names to something more descriptive.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I98b81f3ce0c80fd76614f959667c25b07941e190
diff --git a/plat/arm/board/fvp/include/platform_def.h b/plat/arm/board/fvp/include/platform_def.h
index 6e72b59..541842f 100644
--- a/plat/arm/board/fvp/include/platform_def.h
+++ b/plat/arm/board/fvp/include/platform_def.h
@@ -66,12 +66,13 @@
 #define PLAT_ARM_DRAM2_BASE		ULL(0x880000000)
 #define PLAT_ARM_DRAM2_SIZE		UL(0x80000000)
 
-#define PLAT_HW_CONFIG_DTB_BASE		ULL(0x82000000)
-#define PLAT_HW_CONFIG_DTB_SIZE		ULL(0x8000)
+/* Range of kernel DTB load address */
+#define FVP_DTB_DRAM_MAP_START		ULL(0x82000000)
+#define FVP_DTB_DRAM_MAP_SIZE		ULL(0x8000)
 
 #define ARM_DTB_DRAM_NS			MAP_REGION_FLAT(		\
-					PLAT_HW_CONFIG_DTB_BASE,	\
-					PLAT_HW_CONFIG_DTB_SIZE,	\
+					FVP_DTB_DRAM_MAP_START,		\
+					FVP_DTB_DRAM_MAP_SIZE,		\
 					MT_MEMORY | MT_RO | MT_NS)
 /*
  * Load address of BL33 for this platform port
diff --git a/plat/arm/board/juno/include/platform_def.h b/plat/arm/board/juno/include/platform_def.h
index 5299a7b..d61ba5d 100644
--- a/plat/arm/board/juno/include/platform_def.h
+++ b/plat/arm/board/juno/include/platform_def.h
@@ -53,12 +53,13 @@
 #define PLAT_ARM_DRAM2_BASE		ULL(0x880000000)
 #define PLAT_ARM_DRAM2_SIZE		ULL(0x180000000)
 
-#define PLAT_HW_CONFIG_DTB_BASE		ULL(0x82000000)
-#define PLAT_HW_CONFIG_DTB_SIZE		ULL(0x00008000) /* 32KB */
+/* Range of kernel DTB load address */
+#define JUNO_DTB_DRAM_MAP_START		ULL(0x82000000)
+#define JUNO_DTB_DRAM_MAP_SIZE		ULL(0x00008000) /* 32KB */
 
 #define ARM_DTB_DRAM_NS			MAP_REGION_FLAT(		\
-					PLAT_HW_CONFIG_DTB_BASE,	\
-					PLAT_HW_CONFIG_DTB_SIZE,	\
+					JUNO_DTB_DRAM_MAP_START,	\
+					JUNO_DTB_DRAM_MAP_SIZE,		\
 					MT_MEMORY | MT_RO | MT_NS)
 
 /* virtual address used by dynamic mem_protect for chunk_base */