fix(sgi): increase BL31 carveout size

With SPMC at el3 enabled on rdn2cfg2 configuration BL31 needs more
memory region to accommodate increased xlat table size.

Increase the size by 16K.

Signed-off-by: Nishant Sharma <nishant.sharma@arm.com>
Change-Id: Ib235fe35d53a9b85a5ce0a29f2ec4cc3bd85ded9

plat/arm/css/sgi/include/sgi_base_platform_def.h

@@ -105,7 +105,7 @@
  * A buffer of ~35KB is added to account for future expansion of the image,
  * making it a total of 100KB.
  */
-#define CSS_SGI_BL31_SIZE		(100 * 1024)	/* 100 KB */
+#define CSS_SGI_BL31_SIZE		(116 * 1024)	/* 116 KB */
 #define PLAT_ARM_MAX_BL31_SIZE		(CSS_SGI_BL31_SIZE +		\
 						PLAT_ARM_MAX_BL2_SIZE +	\
 						PLAT_ARM_MAX_BL1_RW_SIZE)