arm: mediatek: retrieve ram_base from dts node for armv8 platform

Now we use fdtdec_setup_mem_size_base() to get DRAM base from fdt ram node
and update gd->ram_base. CFG_SYS_SDRAM_BASE is unused and will be removed.

Also, since mt7622 always passes fdt to linux kernel, there's no need to
assign value to gd->bd->bi_boot_params.

diff --git a/arch/arm/mach-mediatek/mt7622/init.c b/arch/arm/mach-mediatek/mt7622/init.c
index e501907..00d3eb9 100644
--- a/arch/arm/mach-mediatek/mt7622/init.c
+++ b/arch/arm/mach-mediatek/mt7622/init.c
@@ -4,11 +4,15 @@
  * Author: Sam Shih <sam.shih@mediatek.com>
  */
 
-#include <common.h>
 #include <fdtdec.h>
 #include <init.h>
 #include <asm/armv8/mmu.h>
-#include <asm/cache.h>
+#include <asm/system.h>
+#include <asm/global_data.h>
+#include <asm/u-boot.h>
+#include <linux/sizes.h>
+
+DECLARE_GLOBAL_DATA_PTR;
 
 int print_cpuinfo(void)
 {
@@ -20,11 +24,13 @@
 {
 	int ret;
 
-	ret = fdtdec_setup_memory_banksize();
+	ret = fdtdec_setup_mem_size_base();
 	if (ret)
 		return ret;
-	return fdtdec_setup_mem_size_base();
 
+	gd->ram_size = get_ram_size((void *)gd->ram_base, SZ_2G);
+
+	return 0;
 }
 
 void reset_cpu(void)
diff --git a/arch/arm/mach-mediatek/mt7981/init.c b/arch/arm/mach-mediatek/mt7981/init.c
index 3c921d6..862f0ca 100644
--- a/arch/arm/mach-mediatek/mt7981/init.c
+++ b/arch/arm/mach-mediatek/mt7981/init.c
@@ -4,18 +4,25 @@
  * Author: Sam Shih <sam.shih@mediatek.com>
  */
 
-#include <cpu_func.h>
+#include <fdtdec.h>
 #include <init.h>
 #include <asm/armv8/mmu.h>
 #include <asm/system.h>
 #include <asm/global_data.h>
+#include <asm/u-boot.h>
 #include <linux/sizes.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
 int dram_init(void)
 {
-	gd->ram_size = get_ram_size((void *)CFG_SYS_SDRAM_BASE, SZ_2G);
+	int ret;
+
+	ret = fdtdec_setup_mem_size_base();
+	if (ret)
+		return ret;
+
+	gd->ram_size = get_ram_size((void *)gd->ram_base, SZ_1G);
 
 	return 0;
 }
diff --git a/arch/arm/mach-mediatek/mt7986/init.c b/arch/arm/mach-mediatek/mt7986/init.c
index 9d0c0cd..905a3ab 100644
--- a/arch/arm/mach-mediatek/mt7986/init.c
+++ b/arch/arm/mach-mediatek/mt7986/init.c
@@ -4,18 +4,25 @@
  * Author: Sam Shih <sam.shih@mediatek.com>
  */
 
-#include <cpu_func.h>
+#include <fdtdec.h>
 #include <init.h>
 #include <asm/armv8/mmu.h>
 #include <asm/system.h>
 #include <asm/global_data.h>
+#include <asm/u-boot.h>
 #include <linux/sizes.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
 int dram_init(void)
 {
-	gd->ram_size = get_ram_size((void *)CFG_SYS_SDRAM_BASE, SZ_2G);
+	int ret;
+
+	ret = fdtdec_setup_mem_size_base();
+	if (ret)
+		return ret;
+
+	gd->ram_size = get_ram_size((void *)gd->ram_base, SZ_2G);
 
 	return 0;
 }