qemu/arm-nuri: add new sample config

Add the new arm-nuri sample qemu config.
Samsung Exynos4210 Cortex-A9 dual-core testing.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

board/qemu/arm-nuri/readme.txt

@@ -0,0 +1,10 @@
+Run the emulation with:
+
+  qemu-system-arm -M nuri -kernel output/images/zImage -append "console=ttySAC1,115200" -smp 2 -serial null -serial stdio
+
+The login prompt will appear in the terminal that started Qemu. The
+graphical window is the framebuffer.
+
+Startup time is slow because of the SMP CPU emulation so be patient.
+
+Tested with QEMU 1.3.0

configs/qemu_arm_nuri_defconfig

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+# Architecture
+BR2_arm=y
+BR2_cortex_a9=y
+BR2_ARM_ENABLE_NEON=y
+BR2_VFP_FLOAT=y
+# BR2_SOFT_FLOAT is not set
+
+# System
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
+BR2_TARGET_GENERIC_GETTY=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttySAC1"
+
+# Filesystem
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_ROOTFS_INITRAMFS=y
+
+# Lock to 3.7 headers to avoid breaking with newer kernels
+BR2_KERNEL_HEADERS_3_7=y
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.7.1"
+BR2_LINUX_KERNEL_DEFCONFIG="exynos4"
+BR2_LINUX_KERNEL_ZIMAGE=y