board: st: stm32f746-disco: fix console is not enabled while init dram

While initializing dram in spl_dram_init(), mdelay() is called that in
order calls get_ticks() that  verifies if timer exists, if doesn't, it
throws a panic(), but since preloader_console_init() has still not been
called those panic()s will fail. This doesn't help debugging, so let's
setup console before calling spl_dram_init() by moving it after
spl_dram_init().
Signed-off-by: NGiulio Benetti <giulio.benetti@benettiengineering.com>

board/st/stm32f746-disco/stm32f746-disco.c

@@ -69,8 +69,8 @@ int spl_dram_init(void)
 }
 void spl_board_init(void)
 {
-	spl_dram_init();
 	preloader_console_init();
+	spl_dram_init();
 	arch_cpu_init(); /* to configure mpu for sdram rw permissions */
 }
 u32 spl_boot_device(void)