Update to master version of x86_64

Author: phil-opp

Cargo.lock

@@ -32,7 +32,7 @@ required-features = ["uefi_bin"]
 
 [dependencies]
 xmas-elf = { version = "0.6.2", optional = true }
-x86_64 = { git = "https://github.com/rust-osdev/x86_64.git", branch = "access-level-4-table", optional = true }
+x86_64 = { git = "https://github.com/rust-osdev/x86_64.git", optional = true }
 usize_conversions = { version = "0.2.0", optional = true }
 bit_field = { version = "0.10.0", optional = true }
 log = { version = "0.4.8", optional = true }