Bump buildroot to 2019.02

bsp/buildroot/board/freescale/common/imx/genimage.cfg.template_imx8

@@ -0,0 +1,40 @@
+# Minimal SD card image for the Freescale iMX8 boards
+#
+# We mimic the .sdcard Freescale's image format:
+# * the SD card must have 33 kB free space at the beginning,
+# * U-Boot is integrated into imx8-boot-sd.bin and is dumped as is,
+# * a FAT partition at offset 8MB is containing Image and DTB files
+# * a single root filesystem partition is required (ext2, ext3 or ext4)
+#
+
+image boot.vfat {
+  vfat {
+    files = {
+      %FILES%
+    }
+  }
+  size = 32M
+}
+
+image sdcard.img {
+  hdimage {
+  }
+
+  partition imx-boot {
+    in-partition-table = "no"
+    image = "imx8-boot-sd.bin"
+    offset = 33K
+  }
+
+  partition boot {
+    partition-type = 0xC
+    bootable = "true"
+    image = "boot.vfat"
+    offset = 8M
+  }
+
+  partition rootfs {
+    partition-type = 0x83
+    image = "rootfs.ext2"
+  }
+}