staging: ccree: make stub function static inline

The debugfs interface defines stub function if debugfs is not
enabled, which were missing the 'static inline' qualifiers causing
sparse warnings.

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