dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/bus/ti,da850-mstpri.txt

@@ -0,0 +1,20 @@
+* Device tree bindings for Texas Instruments da8xx master peripheral
+  priority driver
+
+DA8XX SoCs feature a set of registers allowing to change the priority of all
+peripherals classified as masters.
+
+Documentation:
+OMAP-L138 (DA850) - http://www.ti.com/lit/ug/spruh82c/spruh82c.pdf
+
+Required properties:
+
+- compatible:		"ti,da850-mstpri" - for da850 based boards
+- reg:			offset and length of the mstpri registers
+
+Example for da850-lcdk is shown below.
+
+mstpri {
+	compatible = "ti,da850-mstpri";
+	reg = <0x14110 0x0c>;
+};