ARM: dts: add dtsi for imx6q and imx6dl

Add dtsi for imx6q and imx6dl with non-common blocks moved into there.
Major differences between imx6dl and imx6q:

 * Dual vs. Quad cores
 * single vs. dual IPU
 * 128 vs. 256 KB OCRAM
 * imx6q: ECSPI5, OpenVG (GC355), SATA
 * imx6dl: I2C4, PXP, EPDC, LCDIF
 * iomuxc/pads definition

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6q-sabrelite.dts

@@ -11,7 +11,7 @@
  */
 
 /dts-v1/;
-/include/ "imx6qdl.dtsi"
+/include/ "imx6q.dtsi"
 
 / {
 	model = "Freescale i.MX6 Quad SABRE Lite Board";