u-boot: update nios2 device tree for 10m50 board

In order for u-boot to work on Nios II architecture,
the device tree file requires adding pre-relocation
flag to the CPU node.

Patch is tested on 10m50 board. Pass booting up
Linux.

[YOCTO #11628]

(From OE-Core rev: 1e301a9f959fd3816d96cfdb6f8530898cefafce)

Signed-off-by: Gan, Yau Wai <yau.wai.gan@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/u-boot/files/10m50-update-device-tree.patch

@@ -0,0 +1,28 @@
+Nios II for MAX10 10m50 board requires update to 
+its device tree to enable CPU driver during
+u-boot pre-relocation. This patch tag the CPU 
+with dm-pre-reloc flag.
+
+Upstream-Status: Submitted
+
+Signed-off-by: Gan, Yau Wai <yau.wai.gan@intel.com>
+
+---
+ arch/nios2/dts/10m50_devboard.dts | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/arch/nios2/dts/10m50_devboard.dts b/arch/nios2/dts/10m50_devboard.dts
+index 05eac30..461ae68 100644
+--- a/arch/nios2/dts/10m50_devboard.dts
++++ b/arch/nios2/dts/10m50_devboard.dts
+@@ -19,6 +19,7 @@
+ 		#size-cells = <0>;
+ 
+ 		cpu: cpu@0 {
++			u-boot,dm-pre-reloc;
+ 			device_type = "cpu";
+ 			compatible = "altr,nios2-1.1";
+ 			reg = <0x00000000>;
+-- 
+2.7.4
+

meta/recipes-bsp/u-boot/u-boot-common_2017.07.inc

@@ -11,6 +11,7 @@ SRCREV = "d85ca029f257b53a96da6c2fb421e78a003a9943"
 
 SRC_URI = "git://git.denx.de/u-boot.git \
     file://MPC8315ERDB-enable-DHCP.patch \
+    file://10m50-update-device-tree.patch \
 "
 
 S = "${WORKDIR}/git"