layer.conf: Add missing dependency for allarch package initramfs-framework

Similiarly to the other previous changes, add a missing allarch package dependency
for initramfs-framework on udev.

(From OE-Core master rev: 00524d0c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Joshua Lock <joshua.lock@collabora.co.uk>