ARM: OMAP: ctrl: Fix CONTROL_DSIPHY register fields

Fix the shift and mask macros for DSIx_PPID fields in CONTROL_DSIPHY. The
OMAP4430 Public TRM vV has these fields mentioned correctly.

Signed-off-by: Archit Taneja <archit@ti.com>
Acked-by: Benoit Cousson <b-cousson@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>