intel_scu_ipc: move osc clock code from SCU IPC core driver

intel_scu_ipc: move osc clock code from SCU IPC core driver

BZ: 32907

Based on current drvier framework, it's not suitable to leave OSC CLK
related code inside the IPC core driver. Move it to intel_scu_ipcutil.

Change-Id: I02981dd1e8f9fea7b521f6d1d07feca0c6dd492e
Signed-off-by: Shijie Zhang <shijie.zhang@intel.com>
Reviewed-on: http://android.intel.com:8080/45901
Reviewed-by: Chen, Jie D <jie.d.chen@intel.com>
Reviewed-by: Yang, Bin <bin.yang@intel.com>
Reviewed-by: Du, Alek <alek.du@intel.com>
Reviewed-by: Wang, Zhifeng <zhifeng.wang@intel.com>
Tested-by: Wang, Zhifeng <zhifeng.wang@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>