ARM: shmobile: Remove ARCH_HAS_CPUFREQ config for shmobile

The following commit has removed ARCH_HAS_CPUFREQ config:

 Commit: e49d9b375628e67c9a718f4befaa8e45e5fad21b
 Subject: ARM: Remove ARCH_HAS_CPUFREQ config option

This patch removes the code that is using ARCH_HAS_CPUFREQ
in mach-shmobile.

Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>