arm64: Fix duplicated Kconfig entries

Probably due to rebasing over the lengthy time it took to get the patch
merged commit addea9ef055b (cpufreq: enable ARM drivers on arm64) added
a duplicate Power management options section.  Add CPUfreq to the CPU
power management section and remove a duplicate include of the main
power section.

Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: 62d1a3ba5adc5653d43f6cd3a90758bb6ad5d5bd
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>