leds: leds-bcm6328: Demote kernel-doc abuse

Fixes the following W=1 kernel build warning(s):

drivers/leds/leds-bcm6328.c:97: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

Cc: Pavel Machek <[e-mail]>
Cc: "Fernández Rojas" <[e-mail]>
Cc: Jonas Gorski <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Pavel Machek <[e-mail]>

drivers/leds/leds-bcm6328.c

···
 #endif
 }
 
-/**
+/*
  * LEDMode 64 bits / 24 LEDs
  * bits [31:0] -> LEDs 8-23
  * bits [47:32] -> LEDs 0-7