ARM: shmobile: Mark all SoCs in shmobile as CPUFreq, capable

Mark all SoCs in shmobile as CPUFreq capable
on multiplatform build only.

Signed-off-by: Benoit Cousson <bcousson@baylibre.com>
[gaku.inami.xw@bp.renesas.com: Move the definition of cpufreq capable]
Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>