eudev: backport patch to fix udevd hanging while trying to access /dev/urandom

eudev: backport patch to fix udevd hanging while trying to access /dev/urandom

Linux kernel commit 48bff1053c17 ("random: opportunistically initialize
on /dev/urandom reads") introduced a change where /dev/urandom blocks if
the random pool is insufficiently initialized during hardware boot. This
behavior causes /dev/urandom reads to hang for approximately 5 seconds,
delaying the boot process with eudev init script (when it calls udevd).

This issue has already been solved upstream, therefore backport the
upstream patch to fix this.

Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>