juno/sgm: Align SCP_BL2 to page boundary

This commit fixes an assertion that was triggering in certain contexts:

    ERROR: mmap_add_region_check() failed. error -22
    ASSERT: lib/xlat_tables_v2/xlat_tables_core.c:790

Change-Id: Ia55b3fb4f496c8cd791ea6093d122edae0a7e92a
Signed-off-by: Chris Kay <chris.kay@arm.com>
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>

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

@@ -253,7 +253,9 @@
  * anything else in this memory region and is handed over to the SCP before
  * BL31 is loaded over the top.
  */
-#define PLAT_CSS_MAX_SCP_BL2_SIZE	(SCP_BL2_LIMIT - ARM_TB_FW_CONFIG_LIMIT)
+#define PLAT_CSS_MAX_SCP_BL2_SIZE \
+	((SCP_BL2_LIMIT - ARM_TB_FW_CONFIG_LIMIT) & ~PAGE_SIZE_MASK)
+
 #define PLAT_CSS_MAX_SCP_BL2U_SIZE	PLAT_CSS_MAX_SCP_BL2_SIZE
 
 #define PLAT_ARM_G1S_IRQ_PROPS(grp) \

plat/arm/css/sgm/include/sgm_base_platform_def.h

@@ -137,7 +137,9 @@
  * anything else in this memory region and is handed over to the SCP before
  * BL31 is loaded over the top.
  */
-#define PLAT_CSS_MAX_SCP_BL2_SIZE	(SCP_BL2_LIMIT - ARM_TB_FW_CONFIG_LIMIT)
+#define PLAT_CSS_MAX_SCP_BL2_SIZE \
+	((SCP_BL2_LIMIT - ARM_TB_FW_CONFIG_LIMIT) & ~PAGE_SIZE_MASK)
+
 #define PLAT_CSS_MAX_SCP_BL2U_SIZE	PLAT_CSS_MAX_SCP_BL2_SIZE
 
 /*