ARM: dts: OMAP36xx: Add CPU OPP table

Add DT OPP table for OMAP36xx/37xx family of devices. This data is
decoded by OF with of_init_opp_table() helper function.

OPP data here is based on existing opp3xxx_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 opp3xxx_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/omap36xx.dtsi

@@ -15,6 +15,19 @@
 		serial3 = &uart4;
 	};
 
+	cpus {
+		/* OMAP3630/OMAP37xx 'standard device' variants OPP50 to OPP130 */
+		cpu@0 {
+			operating-points = <
+				/* kHz    uV */
+				300000   975000
+				600000  1075000
+				800000  1200000
+			>;
+			clock-latency = <300000>; /* From legacy driver */
+		};
+	};
+
 	ocp {
 		uart4: serial@49042000 {
 			compatible = "ti,omap3-uart";