ARM: tegra: remove "Tegra board type" comment from Kconfig

Since the complete conversion to device tree, there are no board-
specific Kconfig options left, so remove the useless Kconfig entry.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Reviewed-by: NThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/mach-tegra/Kconfig

@@ -57,8 +57,6 @@ config TEGRA_AHB
 	  which controls AHB bus master arbitration and some
 	  perfomance parameters(priority, prefech size).
 
-comment "Tegra board type"
-
 choice
         prompt "Default low-level debug console UART"
         default TEGRA_DEBUG_UART_NONE