freedreno: enable a306

Whitelist adreno 306 (as found in msm8916/apq8016).  Works pretty much
out of the box, although the smaller GMEM size requires more tiles to
fit 1920x1080, so bump up the max # of tiles as well.

Since it is just whitelist + trivial change, it makes sense to land on
all the active release branches.

Note that a305c ends up with gpu-id "306", hence a306 ends up with
gpu-id of "307".  Apparently that is what happens when you let the
marketing dept name things.

Cc: "10.4" and "10.5" and "10.6" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Rob Clark <robclark@freedesktop.org>
(cherry picked from commit fcc7d6323b)

src/gallium/drivers/freedreno/freedreno_context.h

@@ -293,7 +293,7 @@ struct fd_context {
 	 */
 	struct fd_gmem_stateobj gmem;
 	struct fd_vsc_pipe      pipe[8];
-	struct fd_tile          tile[64];
+	struct fd_tile          tile[256];
 
 	/* which state objects need to be re-emit'd: */
 	enum {

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -531,6 +531,7 @@ fd_screen_create(struct fd_device *dev)
 	case 220:
 		fd2_screen_init(pscreen);
 		break;
+	case 307:
 	case 320:
 	case 330:
 		fd3_screen_init(pscreen);