staging: ccree: Use __func__ instead of function name

Fixed following checkpatch.pl warning:
	WARNING: Prefer using '"%s...", __func__' to using
the function's name, in a string

It is prefered to use '%s & __func__' instead of function
name for logging.

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