dt-bindings: add vendor prefix and root compatible property for Rockchip boards

This adds vendor prefix and root compatible property for following boards

- Firefly, Firefly-RK3288 boards (both beta and mass production version)
- ChipSPARK, Rayeager PX2 board

PX2 SoC is fully compatible with RK3066.
Signed-off-by: NFUKAUMI Naoki <naobsd@gmail.com>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.txt

@@ -9,6 +9,16 @@ Rockchip platforms device tree bindings
     Required root node properties:
       - compatible = "mundoreader,bq-curie2", "rockchip,rk3066a";
 
+- ChipSPARK Rayeager PX2 board:
+    Required root node properties:
+      - compatible = "chipspark,rayeager-px2", "rockchip,rk3066a";
+
 - Radxa Rock board:
     Required root node properties:
       - compatible = "radxa,rock", "rockchip,rk3188";
+
+- Firefly Firefly-RK3288 board:
+    Required root node properties:
+      - compatible = "firefly,firefly-rk3288", "rockchip,rk3288";
+    or
+      - compatible = "firefly,firefly-rk3288-beta", "rockchip,rk3288";

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -31,6 +31,7 @@ capella	Capella Microsystems, Inc
 cavium	Cavium, Inc.
 cdns	Cadence Design Systems Inc.
 chipidea	Chipidea, Inc
+chipspark	ChipSPARK
 chrp	Common Hardware Reference Platform
 chunghwa	Chunghwa Picture Tubes Ltd.
 cirrus	Cirrus Logic, Inc.
@@ -58,6 +59,7 @@ eukrea  Eukréa Electromatique
 everest	Everest Semiconductor Co. Ltd.
 excito	Excito
 fcs	Fairchild Semiconductor
+firefly	Firefly
 fsl	Freescale Semiconductor
 GEFanuc	GE Fanuc Intelligent Platforms Embedded Systems, Inc.
 gef	GE Fanuc Intelligent Platforms Embedded Systems, Inc.