ARM: shmobile: bockw: remove old style audio clock

ARM: shmobile: bockw: remove old style audio clock

Current audio clock didn't have dependency to device/driver,
but, it was not good design for DT support.
To avoid branch merge conflict issue,
it is using this load map, and this patch is 3) part.
 1) add new style clock in platform
 2) add new style clock method in driver
 3) remove old tyle clock from platform

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 115897dab004f580fc8b4c6bab057940ccb64989)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>