staging: octeon-usb: cvmx-usbnx-defs.h: reformat a comment

Reformat a comment to fit it into 80 columns line lenght.
Signed-off-by: NAaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/octeon-usb/cvmx-usbnx-defs.h

@@ -66,7 +66,8 @@
  *
  * USBN_CLK_CTL = USBN's Clock Control
  *
- * This register is used to control the frequency of the hclk and the hreset and phy_rst signals.
+ * This register is used to control the frequency of the hclk and the
+ * hreset and phy_rst signals.
  */
 union cvmx_usbnx_clk_ctl {
 	uint64_t u64;