Remove pagetable_l0 parameter in virt_to_phys.

[jounathaen]

Currently, virt_to_phys requires the location of the root-pagetable as a parameter. This value can actually be retrieved from the CPUs registers instead, making the interface easier and more flexible.

uhyve/src/arch/x86_64/mod.rs

Lines 196 to 200 in e6ffffa

	pub fn virt_to_phys(
	addr: GuestVirtAddr,
	mem: &MmapMemory,
	pagetable_l0: GuestPhysAddr,
	) -> Result<GuestPhysAddr, PagetableError> {