Introduce arm_setup_page_tables() function

This patch introduces the arm_setup_page_tables() function to
set up page tables on ARM platforms. It replaces the
arm_configure_mmu_elx() functions and does the same thing except
that it doesn't enable the MMU at the end. The idea is to reduce
the amount of per-EL code that is generated by the C preprocessor
by splitting the memory regions definitions and page tables creation
(which is generic) from the MMU enablement (which is the only per-EL
configuration).

As a consequence, the call to the enable_mmu_elx() function has been
moved up into the plat_arch_setup() hook. Any other ARM standard
platforms that use the functions `arm_configure_mmu_elx()` must be
updated.

Change-Id: I6f12a20ce4e5187b3849a8574aac841a136de83d
diff --git a/plat/xilinx/zynqmp/tsp/tsp_plat_setup.c b/plat/xilinx/zynqmp/tsp/tsp_plat_setup.c
index 58a3e2a..19e2c12 100644
--- a/plat/xilinx/zynqmp/tsp/tsp_plat_setup.c
+++ b/plat/xilinx/zynqmp/tsp/tsp_plat_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -90,7 +90,7 @@
  ******************************************************************************/
 void tsp_plat_arch_setup(void)
 {
-	arm_configure_mmu_el1(BL32_RO_BASE,
+	arm_setup_page_tables(BL32_RO_BASE,
 			      (BL32_END - BL32_RO_BASE),
 			      BL32_RO_BASE,
 			      BL32_RO_LIMIT
@@ -99,4 +99,5 @@
 			      BL32_COHERENT_RAM_LIMIT
 #endif
 			      );
+	enable_mmu_el1(0);
 }