plat/arm: enlarge the BL2 size on Arm platforms when TBB is enabled

For Trusted Board Boot, BL2 needs more space to support the ECDSA
and ECDSA+RSA algorithms.

Change-Id: Ie7eda9a1315ce836dbc6d18d6588f8d17891a92d
Signed-off-by: Qixiang Xu <qixiang.xu@arm.com>
diff --git a/plat/arm/board/juno/include/platform_def.h b/plat/arm/board/juno/include/platform_def.h
index 395d1fb..ccc7771 100644
--- a/plat/arm/board/juno/include/platform_def.h
+++ b/plat/arm/board/juno/include/platform_def.h
@@ -12,6 +12,9 @@
 #include <board_css_def.h>
 #include <common_def.h>
 #include <css_def.h>
+#if TRUSTED_BOARD_BOOT
+#include <mbedtls_config.h>
+#endif
 #include <soc_css_def.h>
 #include <tzc400.h>
 #include <v2m_def.h>
@@ -106,7 +109,11 @@
  * little space for growth.
  */
 #if TRUSTED_BOARD_BOOT
-# define PLAT_ARM_MAX_BL2_SIZE		0x19000
+#if TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA_AND_ECDSA
+# define PLAT_ARM_MAX_BL2_SIZE		0x1E000
+#else
+# define PLAT_ARM_MAX_BL2_SIZE		0x1A000
+#endif
 #else
 # define PLAT_ARM_MAX_BL2_SIZE		0xC000
 #endif