[REGRESSION]: x86/idt: Move early IDT setup out of 32-bit asm

[tedheadster]

Thomas,
  I bisected a bug to commit 87e81786b13b267c4355e0d23e33c7e4c08fa63f.
On first generation i486 processors it immediately resets the system
after the "Booting the kernel" message.

- Matthew Whitehead