arm64: tegra: Add NVIDIA P3310 processor module support

The NVIDIA P3310 is a processor module used in several reference designs
that features a Tegra186 SoC, 8 GiB of LPDDR4 RAM, 32 GiB eMMC and other
essentials such as ethernet, WiFi and a PMIC. It is typically connected
to an I/O board (such as the P2597) that provides the connecters needed
to hook it up to the outside world.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi

+#include "tegra186.dtsi"
+
+/ {
+	model = "NVIDIA Tegra186 P3310 Processor Module";
+	compatible = "nvidia,p3310", "nvidia,tegra186";
+
+	aliases {
+		serial0 = &uarta;
+	};
+
+	chosen {
+		bootargs = "earlycon console=ttyS0,115200n8";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x0 0x80000000 0x2 0x00000000>;
+	};
+
+	serial@3100000 {
+		status = "okay";
+	};
+
+	hsp@3c00000 {
+		status = "okay";
+	};
+
+	bpmp {
+		status = "okay";
+	};
+};