clocksource: arm_global_timer: fix non-kernel-doc comment

Use a common C comment "/*" instead of a kernel-doc marker "/**"
to prevent kernel-doc warnings:

arm_global_timer.c:92: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * To ensure that updates to comparator value register do not set the
arm_global_timer.c:92: warning: missing initial short description on line:
 * To ensure that updates to comparator value register do not set the

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Patrice Chotard <[email protected]>
Cc: [email protected]
Cc: Daniel Lezcano <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: rddunlap

drivers/clocksource/arm_global_timer.c

@@ -88,7 +88,7 @@ static u64 gt_counter_read(void)
 	return _gt_counter_read();
 }
 
-/**
+/*
  * To ensure that updates to comparator value register do not set the
  * Interrupt Status Register proceed as follows:
  * 1. Clear the Comp Enable bit in the Timer Control Register.