ARM: tegra: convert to multi-platform

This allows Tegra be included in a kernel build that supports multiple
SoCs at once, which is useful for distro kernels.

This change:
* Moves Tegra's Kconfig into its own directory, as seems typical for
  multi-platform conversions.
* Stops selecting some ARM errata that are incompatible with multi-
  platform. This requires that you use a bootloader that enables the
  workaround!
* Deletes some headers and Makefile.boot that aren't needed now that we
  support multi-platform.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/Kconfig

@@ -663,25 +663,6 @@ config ARCH_LPC32XX
 	help
 	  Support for the NXP LPC32XX family of processors
 
-config ARCH_TEGRA
-	bool "NVIDIA Tegra"
-	select ARCH_HAS_CPUFREQ
-	select ARCH_REQUIRE_GPIOLIB
-	select CLKDEV_LOOKUP
-	select CLKSRC_MMIO
-	select CLKSRC_OF
-	select COMMON_CLK
-	select GENERIC_CLOCKEVENTS
-	select HAVE_CLK
-	select HAVE_SMP
-	select MIGHT_HAVE_CACHE_L2X0
-	select SOC_BUS
-	select SPARSE_IRQ
-	select USE_OF
-	help
-	  This enables support for NVIDIA Tegra based systems (Tegra APX,
-	  Tegra 6xx and Tegra 2 series).
-
 config ARCH_PXA
 	bool "PXA2xx/PXA3xx-based"
 	depends on MMU

arch/arm/mach-tegra/Kconfig

@@ -1,13 +1,28 @@
-if ARCH_TEGRA
+config ARCH_TEGRA
+	bool "NVIDIA Tegra" if ARCH_MULTI_V7
+	select ARCH_HAS_CPUFREQ
+	select ARCH_REQUIRE_GPIOLIB
+	select CLKDEV_LOOKUP
+	select CLKSRC_MMIO
+	select CLKSRC_OF
+	select COMMON_CLK
+	select GENERIC_CLOCKEVENTS
+	select HAVE_CLK
+	select HAVE_SMP
+	select MIGHT_HAVE_CACHE_L2X0
+	select SOC_BUS
+	select SPARSE_IRQ
+	select USE_OF
+	help
+	  This enables support for NVIDIA Tegra based systems.
 
-comment "NVIDIA Tegra options"
+menu "NVIDIA Tegra options"
+	depends on ARCH_TEGRA
 
 config ARCH_TEGRA_2x_SOC
 	bool "Enable support for Tegra20 family"
 	select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
 	select ARM_ERRATA_720789
-	select ARM_ERRATA_742230 if SMP
-	select ARM_ERRATA_751472
 	select ARM_ERRATA_754327 if SMP
 	select ARM_ERRATA_764369 if SMP
 	select ARM_GIC
@@ -26,8 +41,6 @@ config ARCH_TEGRA_2x_SOC
 
 config ARCH_TEGRA_3x_SOC
 	bool "Enable support for Tegra30 family"
-	select ARM_ERRATA_743622
-	select ARM_ERRATA_751472
 	select ARM_ERRATA_754322
 	select ARM_ERRATA_764369 if SMP
 	select ARM_GIC
@@ -71,4 +84,4 @@ config TEGRA_AHB
 config TEGRA_EMC_SCALING_ENABLE
 	bool "Enable scaling the memory frequency"
 
-endif
+endmenu