kernel-yocto: make configuration audit details debug only

kernel-yocto: make configuration audit details debug only

The details of the kernel configuration audit are typically a
debug action, so should be moved to bb.debug(). But in order
to maintain visibility of the results, a reference to the log
file is provided in the standard message.

(From OE-Core rev: 9ab80ad88d34622a81670cdc45cc3275fc3ebabe)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>