Actually save the clock frequency retrieved from fdt data. I fumbled

this when I converted getprop to getencprop.

Submitted by:	Thomas Skibo
Pointy hat to:	ian

sys/arm/arm/mpcore_timer.c

@@ -301,6 +301,7 @@ arm_tmr_attach(device_t dev)
 				    "attribute in FDT\n");
 				return (ENXIO);
 			}
+			sc->clkfreq = clock;
 		}
 	}