Remove license headers

src/arch/aarch64/kernel/bootinfo.rs

src/arch/aarch64/kernel/irq.rs

src/arch/aarch64/kernel/mod.rs

src/arch/aarch64/kernel/percore.rs

src/arch/aarch64/kernel/processor.rs

src/arch/aarch64/kernel/scheduler.rs

src/arch/aarch64/kernel/serial.rs

src/arch/aarch64/kernel/start.rs

src/arch/aarch64/kernel/start.s

src/arch/aarch64/kernel/stubs.rs

src/arch/aarch64/kernel/systemtime.rs

src/arch/aarch64/mm/mod.rs

src/arch/aarch64/mm/paging.rs

src/arch/aarch64/mm/physicalmem.rs

src/arch/aarch64/mm/virtualmem.rs

src/arch/aarch64/mod.rs

src/arch/mod.rs

src/arch/x86_64/kernel/acpi.rs

src/arch/x86_64/kernel/apic.rs

src/arch/x86_64/kernel/boot.asm