x86/mm/tlb: Revert the recent lazy TLB patches

x86/mm/tlb: Revert the recent lazy TLB patches

Revert commits:

  80b585e73477 x86/mm/tlb: Always use lazy TLB mode
  04c7a9f421d1 x86/mm/tlb: Only send page table free TLB flush to lazy TLB CPUs
  413e2f2b5dcb x86/mm/tlb: Make lazy TLB mode lazier
  c352c9435a0e x86/mm/tlb: Restructure switch_mm_irqs_off()
  e549bcdd493e x86/mm/tlb: Leave lazy TLB mode at page table free time

In order to simplify the TLB invalidate fixes for x86 and unify the
parts that need backporting.  We'll try again later.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>