bl2-el3: Add BL2_EL3 image

This patch enables BL2 to execute at the highest exception level
without any dependancy on TF BL1. This enables platforms which already
have a non-TF Boot ROM to directly load and execute BL2 and subsequent BL
stages without need for BL1.  This is not currently possible because
BL2 executes at S-EL1 and cannot jump straight to EL3.

Change-Id: Ief1efca4598560b1b8c8e61fbe26d1f44e929d69
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
diff --git a/lib/cpus/errata_report.c b/lib/cpus/errata_report.c
index 8d9f704..182679d 100644
--- a/lib/cpus/errata_report.c
+++ b/lib/cpus/errata_report.c
@@ -20,6 +20,8 @@
 # define BL_STRING	"BL31"
 #elif defined(AARCH32) && defined(IMAGE_BL32)
 # define BL_STRING	"BL32"
+#elif defined(IMAGE_BL2) && BL2_AT_EL3
+# define BL_STRING "BL2"
 #else
 # error This image should not be printing errata status
 #endif