ARM: tegra: Add device-tree for Pegatron Chagall

Add device-tree for Pegatron Chagall, which is a NVIDIA Tegra30-based
Android tablet.

Link: https://wiki.postmarketos.org/wiki/Pegatron_Chagall_(pegatron-chagall)Co-developed-by: Raffaele Tranquillini <raffaele.tranquillini@gmail.com>
Signed-off-by: Raffaele Tranquillini <raffaele.tranquillini@gmail.com>
Co-developed-by: Ion Agorria <ion@agorria.com>
Signed-off-by: Ion Agorria <ion@agorria.com>
Co-developed-by: Maxim Schwalm <maxim.schwalm@gmail.com>
Signed-off-by: Maxim Schwalm <maxim.schwalm@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[treding@nvidia.com: cosmetic fixups]
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/Makefile

@@ -1329,7 +1329,8 @@ dtb-$(CONFIG_ARCH_TEGRA_3x_SOC) += \
 	tegra30-cardhu-a02.dtb \
 	tegra30-cardhu-a04.dtb \
 	tegra30-colibri-eval-v3.dtb \
-	tegra30-ouya.dtb
+	tegra30-ouya.dtb \
+	tegra30-pegatron-chagall.dtb
 dtb-$(CONFIG_ARCH_TEGRA_114_SOC) += \
 	tegra114-asus-tf701t.dtb \
 	tegra114-dalmore.dtb \