microblaze: Setup distro boot env variables at run time

Setup all the distro boot related environment variables at
run time. Add BOOT_SCRIPT_OFFSET config to microblaze board
Kconfig.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2 files changed