ARM: imx6q: convert to twd_local_timer_register() interface

Add support for the new smp_twd runtime registration interface
to the imx6q platforms, and remove the old compile-time support.

The imx6q DTS file is updated to match the TWD DT documentation.
Also present in this patch a DTS fix to the timer interrupt routing
(the PPI connection uses bits [15:8]) and trigger (rising edge).

Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/arch/arm/boot/dts/imx6q.dtsi b/arch/arm/boot/dts/imx6q.dtsi
index 263e8f3..4905f51 100644
--- a/arch/arm/boot/dts/imx6q.dtsi
+++ b/arch/arm/boot/dts/imx6q.dtsi
@@ -88,9 +88,9 @@
 		ranges;
 
 		timer@00a00600 {
-			compatible = "arm,smp-twd";
-			reg = <0x00a00600 0x100>;
-			interrupts = <1 13 0xf4>;
+			compatible = "arm,cortex-a9-twd-timer";
+			reg = <0x00a00600 0x20>;
+			interrupts = <1 13 0xf01>;
 		};
 
 		L2: l2-cache@00a02000 {