ARM: dts: OMAP4460: Add CPU OPP table

Add DT OPP table for OMAP4460 family of devices. This data is
decoded by OF with of_init_opp_table() helper function.

OPP data here is based on existing opp4xxx_data.c

This is in preparation to use generic cpufreq-cpu0 driver for device
tree enabled boot. Legacy non device tree enabled boot continues to
use omap-cpufreq.c and opp4xxx_data.c.

Signed-off-by: Nishanth Menon <nm@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Jon Hunter <jon-hunter@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Keerthy <j-keerthy@ti.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>

arch/arm/boot/dts/omap4460.dtsi

@@ -10,6 +10,19 @@
 /include/ "omap4.dtsi"
 
 / {
+	cpus {
+		/* OMAP446x 'standard device' variants OPP50 to OPPTurbo */
+		cpu@0 {
+			operating-points = <
+				/* kHz    uV */
+				350000   975000
+				700000  1075000
+				920000  1200000
+			>;
+			clock-latency = <300000>; /* From legacy driver */
+		};
+	};
+
 	pmu {
 		compatible = "arm,cortex-a9-pmu";
 		interrupts = <0 54 0x4>,