Upgrade toolchain channel to 2022-01-05

Cargo.toml

rust-toolchain.toml

src/arch/aarch64/kernel/irq.rs

src/arch/aarch64/kernel/mod.rs

src/arch/aarch64/kernel/processor.rs

src/arch/aarch64/kernel/serial.rs

src/arch/aarch64/kernel/start.rs

src/arch/aarch64/mm/paging.rs

src/arch/x86_64/kernel/irq.rs

src/arch/x86_64/kernel/percore.rs

src/arch/x86_64/kernel/processor.rs

src/arch/x86_64/kernel/scheduler.rs

src/arch/x86_64/kernel/start.rs

src/arch/x86_64/kernel/switch.rs

src/lib.rs

src/syscalls/interfaces/uhyve.rs