Add Armadeus systems APF9328 support.

The APF9328 is an i.MXL+FPGA based SOM (System On Module). Here only minimal
support is added: booting Linux kernel (UART, Ethernet and NOR), Buildroot
toolchain and JFFS2 rootfs.

[Peter: Remove redundant BR2_TARGET_OPTIMIZATION]
Signed-off-by: Julien Boibessot <julien.boibessot@armadeus.com>
Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@armadeus.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>