staging: ccree: use Makefile to include PM code

Replace ugly ifdefs with some inline macros and Makefile magic
for optionally including power management related code for
better readability.

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