disp: msm: dp: Convert clock operations to byte2 ops

Convert clock operation to byte2 ops to meet DISPCC requirement.
Clock unit is changed from KHZ to HZ. Added link clock parent as
freq table is no longer supported in byte2 ops.

Change-Id: Iefeca1ecf7fb6335c45f7664a661d1bbe2d6f1e5
Signed-off-by: Xiaowen Wu <wxiaowen@codeaurora.org>
Signed-off-by: Soutrik Mukhopadhyay <quic_mukhopad@quicinc.com>
Signed-off-by: Nilesh Laad <quic_nlaad@quicinc.com>