gallium/radeon: implement PIPE_CAP_INVALIDATE_BUFFER

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index a8805f6..569f77c 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -278,6 +278,7 @@
 	case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
 	case PIPE_CAP_TGSI_TXQS:
 	case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
+	case PIPE_CAP_INVALIDATE_BUFFER:
 		return 1;
 
 	case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
@@ -355,7 +356,6 @@
 	case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 	case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 	case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
-	case PIPE_CAP_INVALIDATE_BUFFER:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS: