counter: microchip-tcb-capture: Tidy up a false kernel-doc /** marking.

Deals with
W=1 warning This comment starts with '/**', but isn't a kernel-doc comment.

Signed-off-by: Jonathan Cameron <[e-mail]>
Cc: Kamel Bouhara <[e-mail]>
Cc: William Breathitt Gray <[e-mail]>
Acked-by: William Breathitt Gray <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/counter/microchip-tcb-capture.c

···
 // SPDX-License-Identifier: GPL-2.0-only
-/**
+/*
  * Copyright (C) 2020 Microchip
  *
  * Author: Kamel Bouhara <[e-mail]>