Juno: Increase bl2 max size to fix build when SPD=opteed

Building TBBR(SPD=opteed) and non-TBBR TF-A images is breaking for
Juno for different configurations listed below:

* Overflow error of 4096 bytes for rsa algorithm.
* Overflow error of 8192 bytes for ecdsa algorithm.
* Overflow error of 4096 bytes for rsa+ecdsa algorithm.
* Overflow error of 4096 bytes for non-TBBR case.

So this patch increments macro PLAT_ARM_MAX_BL2_SIZE for all the above
cases accordingly.

Change-Id: I75ec6c0a718181d34553fe55437f0496f467683f
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>

plat/arm/board/juno/include/platform_def.h

@@ -110,12 +110,14 @@
  */
 #if TRUSTED_BOARD_BOOT
 #if TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA_AND_ECDSA
-# define PLAT_ARM_MAX_BL2_SIZE		0x1F000
+# define PLAT_ARM_MAX_BL2_SIZE		0x20000
+#elif TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_ECDSA
+# define PLAT_ARM_MAX_BL2_SIZE		0x1D000
 #else
-# define PLAT_ARM_MAX_BL2_SIZE		0x1B000
+# define PLAT_ARM_MAX_BL2_SIZE		0x1C000
 #endif
 #else
-# define PLAT_ARM_MAX_BL2_SIZE		0xD000
+# define PLAT_ARM_MAX_BL2_SIZE		0xE000
 #endif
 
 /*