refactor(xlat): add several refactorizations to the xlat library

This patch includes a number of refactorizations of the xlat library in
order to facilitate the implementation of unittests for the library.
Amongst the improvements there are:

    * Macros to allocate and initialize the translation tables as well
      as the translation context structures have been removed and
      replaced with library APIs.
    * Some of the library APIs have been collapsed, reducing the size
      of the overall interface and presenting a more compact API to
      the consumer.
    * The distinction between the translation base tables and the
      intermediate tables have been removed, presenting now a single
      array of tables for the whole translation context.

The patch also adapts the rest of RMM to use the new library API.

Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com>
Change-Id: I2fb486c0c5bc005446b09e3fef5e7de9bf0efda0
diff --git a/lib/arch/include/arch.h b/lib/arch/include/arch.h
index b2c765c..328c264 100644
--- a/lib/arch/include/arch.h
+++ b/lib/arch/include/arch.h
@@ -140,8 +140,7 @@
 #define TCR_EL2_E0PD1		(UL(1) << 56)	/* TODO: ARMv8.5-E0PD, otherwise RES0 */
 
 #define TCR_TxSZ_MIN		UL(16)
-#define TCR_TxSZ_MAX		UL(39)
-#define TCR_TxSZ_MAX_TTST	UL(48)
+#define TCR_TxSZ_MAX		UL(48)
 
 /* HCR definitions */
 #define HCR_FWB		(UL(1) << 46)