ARM: tegra: Remove cluster switch hooks

Removed cluster switch hooks from cpuquiet if cluster switch isn't
supported for a platform using CONFIG_TEGRA_CLUSTER_CONTROL.

Bug 1427140

Change-Id: I1705eb076427db7bab3efa667da336a26e7f2240
Signed-off-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-on: http://git-master/r/347686
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
Reviewed-by: Krishna Sitaraman <ksitaraman@nvidia.com>
Tested-by: Krishna Sitaraman <ksitaraman@nvidia.com>
Reviewed-by: Alexander Van Brunt <avanbrunt@nvidia.com>

Conflicts:
	arch/arm/mach-tegra/cpuquiet.c