ARC: mm: tlb flush optim: elide redundant uTLB invalidates for MMUv3

For MMUv3 (and prior) the flush_tlb_{range,mm,page} API use the MMU
TLBWrite cmd which already nukes the entire uTLB, so NO need for
additional IVUTLB cmd from utlb_invalidate() - hence this patch

local_flush_tlb_all() is special since it uses a weaker TLBWriteNI
cmd (prec commit) to shoot down JTLB, hence we retain the explicit
uTLB flush

Signed-off-by: Vineet Gupta <[e-mail]>

arch/arc/mm/tlb.c

···
 		}
 	}
 
-	utlb_invalidate();
-
 	local_irq_restore(flags);
 }
 
···
 		start += PAGE_SIZE;
 	}
 
-	utlb_invalidate();
-
 	local_irq_restore(flags);
 }
 
···
 
 	if (asid_mm(vma->vm_mm, cpu) != MM_CTXT_NO_ASID) {
 		tlb_entry_erase((page & PAGE_MASK) | hw_pid(vma->vm_mm, cpu));
-		utlb_invalidate();
 	}
 
 	local_irq_restore(flags);