staging: greybus: fix block comment

This patch fix the coding style problem of block comment detected by the
checkpatch.pl.

WARNING: Block comments use a trailing */ on a separate line
Signed-off-by: NHisao Tanabe <xtanabe@gmail.com>
Acked-by: NJohan Hovold <johan@kernel.org>
Acked-by: NViresh Kumar  <viresh.kumar@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/arche-apb-ctrl.c

@@ -183,7 +183,7 @@ static int standby_boot_seq(struct platform_device *pdev)
 	 * Pasted from WDM spec,
 	 *  - A falling edge on POWEROFF_L is detected (a)
 	 *  - WDM enters standby mode, but no output signals are changed
-	 * */
+	 */
 
 	/* TODO: POWEROFF_L is input to WDM module  */
 	apb->state = ARCHE_PLATFORM_STATE_STANDBY;