arm: imx: m53evk: remove usage of mx53_dram_size

Static variables are not available during board_init_f().
'static uint32_t mx53_dram_size[2];' was used in board specific
dram_init(), dram_init_banksize() and get_effective_memsize() to avoid
multiple calls to get_ram_size().

Reused dram initialization functions from arch/arm/mach-imx/mx5/mx53_dram.c

Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>

arch/arm/mach-imx/mx5/Makefile

@@ -11,4 +11,5 @@ obj-y := soc.o clock.o
 obj-y += lowlevel_init.o
 
 # common files for mx53 dram initialization
+obj-$(CONFIG_TARGET_M53EVK)     += mx53_dram.o
 obj-$(CONFIG_TARGET_MX53CX9020) += mx53_dram.o

board/aries/m53evk/m53evk.c

@@ -31,45 +31,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-static uint32_t mx53_dram_size[2];
-
-phys_size_t get_effective_memsize(void)
-{
-	/*
-	 * WARNING: We must override get_effective_memsize() function here
-	 * to report only the size of the first DRAM bank. This is to make
-	 * U-Boot relocator place U-Boot into valid memory, that is, at the
-	 * end of the first DRAM bank. If we did not override this function
-	 * like so, U-Boot would be placed at the address of the first DRAM
-	 * bank + total DRAM size - sizeof(uboot), which in the setup where
-	 * each DRAM bank contains 512MiB of DRAM would result in placing
-	 * U-Boot into invalid memory area close to the end of the first
-	 * DRAM bank.
-	 */
-	return mx53_dram_size[0];
-}
-
-int dram_init(void)
-{
-	mx53_dram_size[0] = get_ram_size((void *)PHYS_SDRAM_1, 1 << 30);
-	mx53_dram_size[1] = get_ram_size((void *)PHYS_SDRAM_2, 1 << 30);
-
-	gd->ram_size = mx53_dram_size[0] + mx53_dram_size[1];
-
-	return 0;
-}
-
-int dram_init_banksize(void)
-{
-	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
-	gd->bd->bi_dram[0].size = mx53_dram_size[0];
-
-	gd->bd->bi_dram[1].start = PHYS_SDRAM_2;
-	gd->bd->bi_dram[1].size = mx53_dram_size[1];
-
-	return 0;
-}
-
 static void setup_iomux_uart(void)
 {
 	static const iomux_v3_cfg_t uart_pads[] = {