ARM: tegra: remove Whistler support

Whistler is an ancient Tegra 2 reference board. I may have been the only
person who ever used it with upstream software, and I've just recycled
the board hardware. Hence, it makes sense to remove support from software.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/arm/tegra.txt

@@ -29,7 +29,6 @@ board-specific compatible values:
   nvidia,harmony
   nvidia,seaboard
   nvidia,ventana
-  nvidia,whistler
   toradex,apalis_t30
   toradex,apalis_t30-eval
   toradex,apalis-tk1

arch/arm/boot/dts/Makefile

@@ -920,8 +920,7 @@ dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
 	tegra20-seaboard.dtb \
 	tegra20-tec.dtb \
 	tegra20-trimslice.dtb \
-	tegra20-ventana.dtb \
-	tegra20-whistler.dtb
+	tegra20-ventana.dtb
 dtb-$(CONFIG_ARCH_TEGRA_3x_SOC) += \
 	tegra30-apalis-eval.dtb \
 	tegra30-beaver.dtb \