staging: ccree: simplify ioread/iowrite

Registers ioread/iowrite operations were done via macros,
sometime using a "magical" implicit parameter.

Replace all register access with simple inline macros.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>