MIPS: ath79: Fix the DDR control initialization on ar71xx and ar934x

The DDR control initialization needs to know the SoC type, however
ath79_detect_sys_type() was called after ath79_ddr_ctrl_init().
Reverse the order to fix the DDR control initialization on ar71xx and
ar934x.

Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
CC: stable@vger.kernel.org # v4.2+
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11500/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Author: AlbanBedel

arch/mips/ath79/setup.c

@@ -216,9 +216,9 @@ void __init plat_mem_setup(void)
 					   AR71XX_RESET_SIZE);
 	ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
 					 AR71XX_PLL_SIZE);
+	ath79_detect_sys_type();
 	ath79_ddr_ctrl_init();
 
-	ath79_detect_sys_type();
 	if (mips_machtype != ATH79_MACH_GENERIC_OF)
 		detect_memory_region(0, ATH79_MEM_SIZE_MIN, ATH79_MEM_SIZE_MAX);