dmaengine: nbpfaxi: don't build this driver where it cannot be used

Although this driver doesn't have any explicit compile-time architecture
dependencies, it is better not to bloat kernels on those platforms, where
this driver isn't needed, unless a compile test is being performed.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/Kconfig

@@ -386,6 +386,7 @@ config DMA_SUN6I
 config NBPFAXI_DMA
 	tristate "Renesas Type-AXI NBPF DMA support"
 	select DMA_ENGINE
+	depends on ARM || COMPILE_TEST
 	help
 	  Support for "Type-AXI" NBPF DMA IPs from Renesas