Bump buildroot to 2019.02

bsp/buildroot/board/synopsys/hsdk/genimage.cfg

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+image boot.vfat {
+  vfat {
+    files = {
+      "uImage"
+    }
+    file uboot.env {
+      image = "uboot-env.bin"
+    }
+  }
+  size = 20M
+}
+
+image sdcard.img {
+  hdimage {
+  }
+
+  partition boot {
+    partition-type = 0xC
+    bootable = "true"
+    image = "boot.vfat"
+  }
+
+  partition rootfs {
+    partition-type = 0x83
+    image = "rootfs.ext4"
+  }
+}

bsp/buildroot/board/synopsys/hsdk/linux.fragment

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+CONFIG_INITRAMFS_SOURCE=""
+CONFIG_ARC_UBOOT_SUPPORT=y

bsp/buildroot/board/synopsys/hsdk/readme.txt

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+Synopsys, Inc.
+ARC HS Development Kit (HSDK)
+
+https://embarc.org/platforms.html
+
+How to build it
+===============
+
+Select the default configuration for the target:
+$ make snps_archs38_hsdk_defconfig
+
+Optional: modify the configuration:
+$ make menuconfig
+
+Build:
+$ make
+
+Result of the build
+===================
+output/images/
+├── boot.vfat
+├── rootfs.ext2
+├── sdcard.img
+├── u-boot
+├── u-boot.bin
+├── uboot-env.bin
+└── uImage
+
+To copy the image file to the sdcard use dd:
+$ dd if=output/images/sdcard.img of=/dev/XXX
+
+2018, Evgeniy Didin <Evgeniy.Didin@synopsys.com>
+

bsp/buildroot/board/synopsys/hsdk/uboot.env.txt

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+baudrate=115200
+bootargs=root=/dev/mmcblk0p2 rootwait
+bootcmd=fatload mmc 0:1; bootm
+bootdelay=2
+bootfile=uImage
+loadaddr=0x82000000
+stderr=serial0@f0005000
+stdin=serial0@f0005000
+stdout=serial0@f0005000