xlat: Add support for EL0 and EL1 mappings

This patch introduces the ability of the xlat tables library to manage
EL0 and EL1 mappings from a higher exception level.

Attributes MT_USER and MT_PRIVILEGED have been added to allow the user
specify the target EL in the translation regime EL1&0.

REGISTER_XLAT_CONTEXT2 macro is introduced to allow creating a
xlat_ctx_t that targets a given translation regime (EL1&0 or EL3).

A new member is added to xlat_ctx_t to represent the translation regime
the xlat_ctx_t manages. The execute_never mask member is removed as it
is computed from existing information.

Change-Id: I95e14abc3371d7a6d6a358cc54c688aa9975c110
Co-authored-by: Douglas Raillard <douglas.raillard@arm.com>
Co-authored-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Co-authored-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/lib/xlat_tables_v2/xlat_tables.mk b/lib/xlat_tables_v2/xlat_tables.mk
index b94ce5d..06dd844 100644
--- a/lib/xlat_tables_v2/xlat_tables.mk
+++ b/lib/xlat_tables_v2/xlat_tables.mk
@@ -7,3 +7,5 @@
 XLAT_TABLES_LIB_SRCS	:=	$(addprefix lib/xlat_tables_v2/,	\
 				${ARCH}/xlat_tables_arch.c		\
 				xlat_tables_internal.c)
+
+INCLUDES		+=	-Ilib/xlat_tables_v2/${ARCH}