platform: add DSI_PHY and DSI_PLL offsets in iomap headers

The DSI PHY and PLL register base addresses are different for
different targets from the DSI controller base. Update the
iomap header files of the targets with their base address
macros.

Change-Id: Ifd35a0e2195c34d872c7fa6ab7377d22cc06a768
5 files changed