ARM: tegra30: Make MC optional in Kconfig

For bare minimal system.
Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/arm/mach-tegra/Kconfig

@@ -41,8 +41,6 @@ config ARCH_TEGRA_3x_SOC
 	select ARM_ERRATA_764369
 	select PL310_ERRATA_769419 if CACHE_L2X0
 	select CPU_FREQ_TABLE if CPU_FREQ
-	select MEMORY
-	select TEGRA30_MC
 	help
 	  Support for NVIDIA Tegra T30 processor family, based on the
 	  ARM CortexA9MP CPU and the ARM PL310 L2 cache controller

drivers/memory/Kconfig

@@ -31,7 +31,13 @@ config TEGRA20_MC
 	  Relocation Table) module.
 
 config TEGRA30_MC
-	bool
+	bool "Tegra30 Memory Controller(MC) driver"
+	default y
 	depends on ARCH_TEGRA_3x_SOC
+	help
+	  This driver is for the Memory Controller(MC) module available
+	  in Tegra30 SoCs, mainly for a address translation fault
+	  analysis, especially for IOMMU/SMMU(System Memory Management
+	  Unit) module.
 
 endif