device/main/u-boot-librem5: upgrade to 2022.04_git20220420
This also re-enables the auto flashing for u-boot on the L5, but keeps it disabled on the devkit for now until this u-boot supports the devkit again.
This also re-enables the auto flashing for u-boot on the L5, but keeps it disabled on the devkit for now until this u-boot supports the devkit again.