drm/msm: adreno a306 support

As found in apq8016 (used in DragonBoard 410c) and msm8916.

Note that numerically a306 is actually 307 (since a305c already claimed
306).  Nice and confusing.

Signed-off-by: Rob Clark <robdclark@gmail.com>
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 98977ab1..4016aef 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -522,6 +522,7 @@
 
 static const char *clk_names[] = {
 		"src_clk", "core_clk", "iface_clk", "mem_clk", "mem_iface_clk",
+		"alt_mem_iface_clk",
 };
 
 int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,