platform: update the DSI PLL APIs to use DSI_PLL base

The PLL register offsets from the DSI controller base
is not same for all targets. Update the auto PLL and
DSI PLL lock APIs to use the DSI_PLL base to handle
these cases.

Change-Id: Ie8aebc1bcc2b63f6825964c3476ce5cb6d0e7732
5 files changed