i965: Delete unused INTEL_WRITE_{PART,FULL} and INTEL_READ #defines.

These are just software flag values (not hardware specific values), and
aren't used anywhere.  Delete them to avoid confusion.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_context.h

@@ -139,10 +139,6 @@ extern "C" {
  * Handles blending and (presumably) depth and stencil testing.
  */
 
-#define INTEL_WRITE_PART  0x1
-#define INTEL_WRITE_FULL  0x2
-#define INTEL_READ        0x4
-
 #define BRW_MAX_CURBE                    (32*16)
 
 struct brw_context;