[OE-core] [RFC] get minimal rootfs to be even smaller

[Marcin Juszkiewicz]

I build core-image-minimal today and got 5.1MB image (AArch64/eglibc).
Looked inside the image and found some extra files which can be dropped.

First hit: pci.ids.gz and usb.ids.gz ~350KB in total.

Normally they are needed for lspci/lsusb but they are brought by udev
which does not need them.

Next one can be ldconfig which is ~600KB.

What do you think?