linux-yocto: Enable debug/printk.scc KERNEL_FEATURE on qemuall machines.

linux-yocto: Enable debug/printk.scc KERNEL_FEATURE on qemuall machines.

We are experimenting some issues in the Autobuilder infraestructure
possible due to high I/O loads, in order to provide more information
about intervals of times in printk enable by default debug/printk.scc
on qemu development images.

[YOCTO #9299]

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>