msm: msm_dsps: Move to the new clk_prepare/unprepare API.

The Linux clock driver is moving to the new clk_prepare/
unprepare API. Move to this new API.

Change-Id: Ic24ab89f0c22efa6ad67c3969769c80cdaa5b484
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>