arm: rmobile: lager: Remove dram_init_banksize function

Lager board is defined CONFIG_SYS_SDRAM_BASE, and this can use a basic function of
dram_init_banksize instead.
Signed-off-by: NNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>

board/renesas/lager/lager.c

@@ -93,7 +93,7 @@ DECLARE_GLOBAL_DATA_PTR;
 int board_init(void)
 {
 	/* adress of boot parameters */
-	gd->bd->bi_boot_params = LAGER_SDRAM_BASE + 0x100;
+	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
 
 	/* Init PFC controller */
 	r8a7790_pinmux_init();
@@ -174,12 +174,6 @@ const struct rmobile_sysinfo sysinfo = {
 	CONFIG_RMOBILE_BOARD_STRING
 };
 
-void dram_init_banksize(void)
-{
-	gd->bd->bi_dram[0].start = LAGER_SDRAM_BASE;
-	gd->bd->bi_dram[0].size = LAGER_SDRAM_SIZE;
-}
-
 void reset_cpu(ulong addr)
 {
 	u8 val;