dev: gcdb: extend platform specific offsets check to DSI PHY/PLL

In the current implementation, the platform specific offset
adjustment is done only for DSI controller base. Derived
platforms may have different base addresses than the base
platform for DSI PHY/PLL/regulator as well. Add support for this.

Change-Id: Icf2f0e0e0edb7c78c4148c275e80e08022294125
1 file changed