board: motorola: add Atrix 4G MB860 and Droid X2 MB870 support

The Motorola Atrix 4G (MB860) and Droid X2 (MB870) both featured a
dual-core NVIDIA Tegra 2 AP20H processor clocked at 1GHz, coupled with 1GB
of DDR2 RAM. Storage consisted of 16GB of internal flash memory, expandable
via microSD. The display was a 4.0-inch TFT LCD with a resolution of
960x540 pixels (qHD). The devices originally ran on Android up to 2.3
(Gingerbread).

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/arch/arm/dts/tegra20-motorola-olympus.dts b/arch/arm/dts/tegra20-motorola-olympus.dts
new file mode 100644
index 0000000..bba5513
--- /dev/null
+++ b/arch/arm/dts/tegra20-motorola-olympus.dts
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "tegra20-motorola-mot.dtsi"
+
+/ {
+	model = "Motorola Atrix 4G (MB860)";
+	compatible = "motorola,olympus", "nvidia,tegra20";
+};