thunderbolt: Capitalize comment on top of QUIRK_FORCE_POWER_LINK_CONTROLLER

To keep it consistent with the other single line comments in the driver.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/tb.h

@@ -1007,7 +1007,7 @@ int usb4_usb3_port_allocate_bandwidth(struct tb_port *port, int *upstream_bw,
 int usb4_usb3_port_release_bandwidth(struct tb_port *port, int *upstream_bw,
 				     int *downstream_bw);
 
-/* keep link controller awake during update */
+/* Keep link controller awake during update */
 #define QUIRK_FORCE_POWER_LINK_CONTROLLER		BIT(0)
 
 void tb_check_quirks(struct tb_switch *sw);