thunderbolt: Expand controller name in tb_switch_is_xy()

For a casual reader tb_switch_is_cr() does not tell much so instead
spell out the full controller name in the function name. For example
tb_switch_is_cr() becomes tb_switch_is_cactus_ridge() which is easier
to understand.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index f2ce6ad..e8e2d20 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -342,9 +342,9 @@ static struct tb_port *tb_find_pcie_down(struct tb_switch *sw,
 		 * Hard-coded Thunderbolt port to PCIe down port mapping
 		 * per controller.
 		 */
-		if (tb_switch_is_cr(sw))
+		if (tb_switch_is_cactus_ridge(sw))
 			index = !phy_port ? 6 : 7;
-		else if (tb_switch_is_fr(sw))
+		else if (tb_switch_is_falcon_ridge(sw))
 			index = !phy_port ? 6 : 8;
 		else
 			goto out;