ARM: uniphier: increase CONFIG_SYS_MONITOR_LEN

With the recent changes, the size of the U-Boot proper image for
uniphier_v7_defconfig exceeded the current limit, 512KB, then SPL
fails to load the whole of the U-Boot proper.  Increase the size.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/include/configs/uniphier.h b/include/configs/uniphier.h
index 1b4140d..a00bfd9 100644
--- a/include/configs/uniphier.h
+++ b/include/configs/uniphier.h
@@ -33,7 +33,7 @@
 
 #define CONFIG_SYS_MAX_FLASH_SECT	256
 #define CONFIG_SYS_MONITOR_BASE		0
-#define CONFIG_SYS_MONITOR_LEN		0x00080000	/* 512KB */
+#define CONFIG_SYS_MONITOR_LEN		0x00090000	/* 576KB */
 #define CONFIG_SYS_FLASH_BASE		0
 
 /*