ARM: tegra: remove CONFIG_MACH_TEGRA_DT

* Make ARCH_TEGRA select USE_OF; DT is the way forward.
* Build board-dt-tegra*.c when the relevant Tegra SoC support is enabled,
  rather than requiring a specific config option for this.
* The board-specific config options already build board-*-pinmux.o, and
  when booting from device tree these files are no longer needed, so we
  can remove some Makefile commands related to those files.
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/Kconfig

@@ -645,6 +645,7 @@ config ARCH_TEGRA
 	select MIGHT_HAVE_CACHE_L2X0
 	select NEED_MACH_IO_H if PCI
 	select ARCH_HAS_CPUFREQ
+	select USE_OF
 	help
 	  This enables support for NVIDIA Tegra based systems (Tegra APX,
 	  Tegra 6xx and Tegra 2 series).

arch/arm/mach-tegra/Kconfig

@@ -87,13 +87,6 @@ config MACH_SEABOARD
 	 also be included for some of the derivative boards that
 	 have large similarities with the seaboard design.
 
-config MACH_TEGRA_DT
-	bool "Generic Tegra20 board (FDT support)"
-	depends on ARCH_TEGRA_2x_SOC
-	select USE_OF
-	help
-	  Support for generic NVIDIA Tegra20 boards using Flattened Device Tree
-
 config MACH_TRIMSLICE
        bool "TrimSlice board"
        depends on ARCH_TEGRA_2x_SOC

arch/arm/mach-tegra/Makefile

@@ -13,7 +13,6 @@ obj-$(CONFIG_CPU_IDLE)			+= sleep.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= powergate.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra2_clocks.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= tegra2_emc.o
-obj-$(CONFIG_ARCH_TEGRA_3x_SOC)		+= board-dt-tegra30.o
 obj-$(CONFIG_ARCH_TEGRA_3x_SOC)		+= tegra30_clocks.o
 obj-$(CONFIG_SMP)			+= platsmp.o headsmp.o
 obj-$(CONFIG_SMP)                       += reset.o
@@ -23,6 +22,9 @@ obj-$(CONFIG_CPU_FREQ)                  += cpu-tegra.o
 obj-$(CONFIG_TEGRA_PCI)			+= pcie.o
 obj-$(CONFIG_USB_SUPPORT)		+= usb_phy.o
 
+obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= board-dt-tegra20.o
+obj-$(CONFIG_ARCH_TEGRA_3x_SOC)		+= board-dt-tegra30.o
+
 obj-$(CONFIG_MACH_HARMONY)              += board-harmony.o
 obj-$(CONFIG_MACH_HARMONY)              += board-harmony-pinmux.o
 obj-$(CONFIG_MACH_HARMONY)              += board-harmony-pcie.o
@@ -34,11 +36,5 @@ obj-$(CONFIG_MACH_PAZ00)		+= board-paz00-pinmux.o
 obj-$(CONFIG_MACH_SEABOARD)             += board-seaboard.o
 obj-$(CONFIG_MACH_SEABOARD)             += board-seaboard-pinmux.o
 
-obj-$(CONFIG_MACH_TEGRA_DT)             += board-dt-tegra20.o
-obj-$(CONFIG_MACH_TEGRA_DT)             += board-harmony-pinmux.o
-obj-$(CONFIG_MACH_TEGRA_DT)             += board-seaboard-pinmux.o
-obj-$(CONFIG_MACH_TEGRA_DT)             += board-paz00-pinmux.o
-obj-$(CONFIG_MACH_TEGRA_DT)             += board-trimslice-pinmux.o
-
 obj-$(CONFIG_MACH_TRIMSLICE)            += board-trimslice.o
 obj-$(CONFIG_MACH_TRIMSLICE)            += board-trimslice-pinmux.o