drm: msm: dsi-staging: add support for additional display clocks

DSI controller v2.0 requires configuring an additional clock
called the byte interface clock which is needed to drive high
speed PPI signals. Also, there is an extra core clock called
MNOC AHB clock which is needed on msm8998. Add support for these
clocks.

CRs-Fixed: 2008002
Change-Id: Icc5526f3ee99ee796b040a7bfa5a5340a24488b1
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>