ARM: uniphier: set DRAM_SPARSE flag for LD21 boards

Commit 04cd4e7215d3 ("ARM: uniphier: remove DRAM base address from
board parameters") accidentally unset the DRAM_SPARSE flag, and
changed the physical map of the DRAM channels.  Revive the original
behavior.

Fixes: 04cd4e7215d3 ("ARM: uniphier: remove DRAM base address from board parameters")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reported-by: Shunji Sato <sato.shunji@socionext.com>
diff --git a/arch/arm/mach-uniphier/boards.c b/arch/arm/mach-uniphier/boards.c
index db7d192..e3b9335 100644
--- a/arch/arm/mach-uniphier/boards.c
+++ b/arch/arm/mach-uniphier/boards.c
@@ -199,7 +199,7 @@
 		.size = 0x40000000,
 		.width = 32,
 	},
-	.flags = UNIPHIER_BD_BOARD_LD21_GLOBAL,
+	.flags = UNIPHIER_BD_DRAM_SPARSE | UNIPHIER_BD_BOARD_LD21_GLOBAL,
 };
 #endif