OMAP3+: OPP: Replace voltage values with Macros

Since all voltage data is now centralized in oppxxx_data.c, we can replace
the values in the opp table with the macros used for voltage values.

This will avoid opp table and voltage layer having conflicting values.

Signed-off-by: Vishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>