x86: Remove unused IOMMU_STRESS Kconfig

Last use of IOMMU_STRESS was removed in commit 29b6841 ("x86:
amd_iommu: move to drivers/iommu/"). 6 years later the Kconfig entry is
definitely due for removal.

Signed-off-by: Corentin Labbe <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Joerg Roedel <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

Author: montjoie

arch/x86/Kconfig.debug

@@ -169,14 +169,6 @@ config IOMMU_DEBUG
 	  options. See Documentation/x86/x86_64/boot-options.txt for more
 	  details.
 
-config IOMMU_STRESS
-	bool "Enable IOMMU stress-test mode"
-	---help---
-	  This option disables various optimizations in IOMMU related
-	  code to do real stress testing of the IOMMU code. This option
-	  will cause a performance drop and should only be enabled for
-	  testing.
-
 config IOMMU_LEAK
 	bool "IOMMU leak tracing"
 	depends on IOMMU_DEBUG && DMA_API_DEBUG