ARM: uniphier: rework struct uniphier_board_data

This commit reworks "struct uniphier_board_data" with an array of
DRAM channel data in it.  It will allow further cleanups by means of
"for" statements that iterate over the DDR channels.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/bcu/bcu-ph1-ld4.c b/arch/arm/mach-uniphier/bcu/bcu-ph1-ld4.c
index f82c7d1..bbe8a74 100644
--- a/arch/arm/mach-uniphier/bcu/bcu-ph1-ld4.c
+++ b/arch/arm/mach-uniphier/bcu/bcu-ph1-ld4.c
@@ -22,7 +22,7 @@
 	writel(0x11111111, BCSCR5); /* 0xe0000000-0Xffffffff: IPPC/IPPD-bus */
 
 	/* Specify DDR channel */
-	shift = (bd->dram_ch1_base - bd->dram_ch0_base) / 0x04000000 * 4;
+	shift = (bd->dram_ch[1].base - bd->dram_ch[0].base) / 0x04000000 * 4;
 	writel(ch(shift), BCIPPCCHR2); /* 0x80000000-0x9fffffff */
 
 	shift -= 32;