drm/radeon/kms: fix legacy get_engine/memory clock

Fix a bad shift in the post div.

Should fix fdo bug 26145
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_clocks.c

@@ -56,7 +56,7 @@ uint32_t radeon_legacy_get_engine_clock(struct radeon_device *rdev)
 	else if (post_div == 3)
 		sclk >>= 2;
 	else if (post_div == 4)
-		sclk >>= 4;
+		sclk >>= 3;
 
 	return sclk;
 }
@@ -86,7 +86,7 @@ uint32_t radeon_legacy_get_memory_clock(struct radeon_device *rdev)
 	else if (post_div == 3)
 		mclk >>= 2;
 	else if (post_div == 4)
-		mclk >>= 4;
+		mclk >>= 3;
 
 	return mclk;
 }