i965/miptree: Add new entrypoints for resolve management

i965/miptree: Add new entrypoints for resolve management

This commit adds a new unified interface for doing resolves.  The basic
format is that, prior to any surface access such as texturing or
rendering, you call intel_miptree_prepare_access.  If the surface was
written, you call intel_miptree_finish_write.  These two functions take
parameters which tell them whether or not auxiliary compression and fast
clears are supported on the surface.  Later commits will add wrappers
around these two functions for texturing, rendering, etc.

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>