Bump buildroot to 2019.02

bsp/buildroot/board/zynqmp/post-image.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# By default U-Boot loads DTB from a file named "system.dtb", so
+# let's use a symlink with that name that points to the *first*
+# devicetree listed in the config.
+
+FIRST_DT=$(sed -nr \
+               -e 's|^BR2_LINUX_KERNEL_INTREE_DTS_NAME="xilinx/([-_/[:alnum:]\\.]*).*"$|\1|p' \
+               ${BR2_CONFIG})
+
+[ -z "${FIRST_DT}" ] || ln -fs ${FIRST_DT}.dtb ${BINARIES_DIR}/system.dtb
+
+support/scripts/genimage.sh -c board/zynqmp/genimage.cfg