arm: Fix #if/#ifdef typo in topology.c

Probably a typo in arch/arm/kernel/topology.c

This patch fixes the warning...

arch/arm/kernel/topology.c: In function 'scale_cpu_capacity':
arch/arm/kernel/topology.c:47:5: warning: "CONFIG_CPU_FREQ" is not defined [-Wundef]

Fixes: Change-Id: If5e9e0ba8ff5a5d3236b373dbce8c72ea71b5e18
       ("arm: Enable max freq invariant scheduler load-tracking and capacity support")
Signed-off-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>