Other ST boards have their openocd.cfg support file updated,
but Nucleo L476RG was still looking for board/st_nucleo_l476rg.cfg
and fails with Zephyr SDK 0.9.5.
Signed-off-by: Kiril Zyapkov <k.zyapkov@allterco.com>
the current zephyr sdk now includes openocd configurations for l4
boards, we can now update the boards and docs to reflect this
Signed-off-by: Arthur SFEZ <arthur.sfez@gmail.com>