r300: Use the defined values when writing to R300_VAP_INPUT_CNTL_[01].

You can verify this is correct with the following code.

  assert (0x00000001 == R300_INPUT_CNTL_0_COLOR);

  assert (0x00000405 ==
	  (R300_INPUT_CNTL_POS | R300_INPUT_CNTL_COLOR |
	   R300_INPUT_CNTL_TC0));

src/mesa/drivers/dri/r300/r300_ioctl.c

@@ -210,10 +210,12 @@ static void r300EmitClearState(GLcontext * ctx)
 	reg_start(R300_VAP_INPUT_ROUTE_1_0, 0);
 	e32(0xF688F688);
 
+	/* R300_VAP_INPUT_CNTL_0, R300_VAP_INPUT_CNTL_1 */
 	R300_STATECHANGE(r300, vic);
 	reg_start(R300_VAP_INPUT_CNTL_0, 1);
-	e32(0x00000001);
-	e32(0x00000405);
+	e32(R300_INPUT_CNTL_0_COLOR);
+	e32(R300_INPUT_CNTL_POS | R300_INPUT_CNTL_COLOR | R300_INPUT_CNTL_TC0);
+
 
 	if (!has_tcl) {
 		R300_STATECHANGE(r300, vte);