configs/apf9328: use default gcc version

The gcc 4.4 version has been deprecated recently, so we cannot use it
anymore. Since this platform is just using a normal ARM processor with
nothing special, we can expect the default gcc version to just work.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>