Raspberry Pi: Add U-Boot version to image boot partition

Changelog: Title

Signed-off-by: Mirza Krak <mirza.krak@northern.tech>

configs/raspberrypi_config

@@ -64,6 +64,7 @@ function platform_modify() {
   run_and_log_cmd "sudo cp work/rpi/binaries/u-boot.bin work/boot/${RASPBERRYPI_BOOTLOADER_IMAGE}"
   run_and_log_cmd "sudo cp work/rpi/binaries/boot.scr work/boot"
   run_and_log_cmd "sudo cp work/rpi/binaries/fw_env.config work/rootfs/etc/"
+  run_and_log_cmd "sudo cp work/rpi/binaries/uboot-git-log.txt work/boot"
 
   # Raspberry Pi applications expect to find this on the device and in some
   # cases parse the options to determinate functionality.