ARM: at91: Don't invoke spl_boot_device() twice

Since the spl_boot_mode() is now passed the boot device to boot from,
make use of it instead of inquiring for the boot device again. This
allows board_boot_order() to function correctly.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andreas Bießmann <andreas.devel@googlemail.com>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
diff --git a/arch/arm/mach-at91/spl.c b/arch/arm/mach-at91/spl.c
index ad6a597..98f280c 100644
--- a/arch/arm/mach-at91/spl.c
+++ b/arch/arm/mach-at91/spl.c
@@ -77,7 +77,7 @@
 
 u32 spl_boot_mode(const u32 boot_device)
 {
-	switch (spl_boot_device()) {
+	switch (boot_device) {
 #ifdef CONFIG_SYS_USE_MMC
 	case BOOT_DEVICE_MMC1:
 	case BOOT_DEVICE_MMC2: