coresight: etm3x: Fix build warning

The missing * in the comment block causes the following warning, so fix
it:

  hwtracing/coresight/coresight-etm3x-core.c:118: warning: bad line:
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20231123120459.287578-3-james.clark@arm.com

drivers/hwtracing/coresight/coresight-etm3x-core.c

@@ -115,7 +115,7 @@ static void etm_clr_pwrup(struct etm_drvdata *drvdata)
  *
  * Basically the same as @coresight_timeout except for the register access
  * method where we have to account for CP14 configurations.
-
+ *
  * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
  * TIMEOUT_US has elapsed, which ever happens first.
  */