Move BL_COHERENT_RAM_BASE/END defines to common_def.h

We have lots of duplicated defines (and comment blocks too).
Move them to include/plat/common/common_def.h.

While we are here, suffix the end address with _END instead of
_LIMIT.  The _END is a better fit to indicate the linker-derived
real end address.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/plat/qemu/qemu_bl31_setup.c b/plat/qemu/qemu_bl31_setup.c
index 7a48358..547e135 100644
--- a/plat/qemu/qemu_bl31_setup.c
+++ b/plat/qemu/qemu_bl31_setup.c
@@ -47,16 +47,6 @@
 #define BL31_END (unsigned long)(&__BL31_END__)
 
 /*
- * The next 2 constants identify the extents of the coherent memory region.
- * These addresses are used by the MMU setup code and therefore they must be
- * page-aligned.  It is the responsibility of the linker script to ensure that
- * __COHERENT_RAM_START__ and __COHERENT_RAM_END__ linker symbols
- * refer to page-aligned addresses.
- */
-#define BL31_COHERENT_RAM_BASE (unsigned long)(&__COHERENT_RAM_START__)
-#define BL31_COHERENT_RAM_LIMIT (unsigned long)(&__COHERENT_RAM_END__)
-
-/*
  * Placeholder variables for copying the arguments that have been passed to
  * BL3-1 from BL2.
  */
@@ -105,7 +95,7 @@
 {
 	qemu_configure_mmu_el3(BL31_RO_BASE, (BL31_END - BL31_RO_BASE),
 			      BL31_RO_BASE, BL31_RO_LIMIT,
-			      BL31_COHERENT_RAM_BASE, BL31_COHERENT_RAM_LIMIT);
+			      BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END);
 }
 
 static const unsigned int irq_sec_array[] = {