ARM: S3C24XX: Move audio-simtec.h to plat-s3c24xx

Continue the clearout of plat-s3c by moving audio-simtec.h to plat-s3c24xx
as there are no current implementations outside of this platform.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/plat-s3c/include/plat/audio-simtec.h → arch/arm/plat-s3c24xx/include/plat/audio-simtec.h

-/* arch/arm/plat-s3c/include/plat/audio-simtec.h
+/* arch/arm/plat-s3c24xx/include/plat/audio-simtec.h
  *
  * Copyright 2008 Simtec Electronics
  *	http://armlinux.simtec.co.uk/