ARM: imx5: reuse clock CCM mapping in pm code

ARM: imx5: reuse clock CCM mapping in pm code

The imx5 pm code needs to access CCM registers.  Let's remove the use
of CCM static mapping in pm code by reusing the dynamic mapping created
in clock code.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>