Revert "x86-64/efi: Use EFI to deal with platform wall clock (again)"

Revert "x86-64/efi: Use EFI to deal with platform wall clock (again)"

This reverts commit c032bc46b3ac ("x86-64/efi: Use EFI to deal with
platform wall clock (again)"), and the two supporting commits:

  1e37072021ea: "x86/kernel: remove tboot 1:1 page table creation code"

  f06b08fd6acd: "x86, efi: 1:1 pagetable mapping for virtual EFI calls")

as they all depend semantically on commit 0dbf99f043c3 ("x86, mm:
Include the entire kernel memory map in trampoline_pgd") that got
reverted earlier due to the problems it caused.

This was pointed out by Yinghai Lu, and verified by me on my Macbook Air
that uses EFI.

Pointed-out-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>