ARM: tegra: Move AHB Kconfig to drivers/amba

This will allow the Kconfig option to be shared among 32-bit and 64-bit
ARM.

Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/amba/Kconfig

@@ -1,2 +1,14 @@
 config ARM_AMBA
 	bool
+
+if ARM_AMBA
+
+config TEGRA_AHB
+	bool "Enable AHB driver for NVIDIA Tegra SoCs"
+	default y if ARCH_TEGRA
+	help
+	  Adds AHB configuration functionality for NVIDIA Tegra SoCs,
+	  which controls AHB bus master arbitration and some performance
+	  parameters (priority, prefetch size).
+
+endif