amba: tegra-ahb: enable compile testing

There seems to be nothing preventing this driver from being compile
tested so enable that to increase build coverage.

This also allows for compile testing of further Tegra drivers (e.g.
IOMMU driver).

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

Author: jhovold

drivers/amba/Kconfig

@@ -5,7 +5,7 @@ config ARM_AMBA
 if ARM_AMBA
 
 config TEGRA_AHB
-	bool
+	bool "Enable AHB driver for NVIDIA Tegra SoCs" if COMPILE_TEST
 	default y if ARCH_TEGRA
 	help
 	  Adds AHB configuration functionality for NVIDIA Tegra SoCs,