freedreno: use autogenerated register defs

freedreno: use autogenerated register defs

Switch to use the envytools generated headers for register/bitfield
definitions.  This is the first step in preparing to add a3xx support,
since it avoids having conflicting names for a3xx and a2xx registers.
And since I'm using envytools for a3xx it is simpler to just use it for
everything.

This shouldn't cause any functional change, it is really just a lot of
renaming.

Signed-off-by: Rob Clark <robdclark@gmail.com>