OMAPDSS: DPI: cleanup pll & regulator init
OMAPDSS: DPI: cleanup pll & regulator init

Split regulator and DSI PLL init code to their own functions for
clarity.

Signed-off-by: Tomi Valkeinen <e1ca4dbb8be1acaf20734fecd2da10ed1d46a9bb@ti.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs