Moving uefi build to separate uefi manifest

Bug: 316570668
Test: checkout uefi-gbl-mainline, cp this topic, tools/bazel run //bootable/libbootloader:gbl_efi_dist --extra_toolchains=@gbl//toolchain:all
Change-Id: I7d9e4bbe0851f194f1f35b494e970973de189080