x86/Kconfig: Remove the unused X86_DMA_REMAP KConfig symbol

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20190410080220.21705-2-hch@lst.deSigned-off-by: NIngo Molnar <mingo@kernel.org>

arch/x86/Kconfig

@@ -704,7 +704,6 @@ config STA2X11
 	depends on X86_32_NON_STANDARD && PCI
 	select ARCH_HAS_PHYS_TO_DMA
 	select X86_DEV_DMA_OPS
-	select X86_DMA_REMAP
 	select SWIOTLB
 	select MFD_STA2X11
 	select GPIOLIB
@@ -2886,10 +2885,6 @@ config X86_DEV_DMA_OPS
 	bool
 	depends on X86_64 || STA2X11
 
-config X86_DMA_REMAP
-	bool
-	depends on STA2X11
-
 config HAVE_GENERIC_GUP
 	def_bool y