linux-yocto-custom: update sama5d3_xplained defconfig

This makes it work with modern userspace:

* enable CONFIG_FHANDLE for recent udev versions
* disable SYSFS_DEPRECATED to work with udev versions released after 2011
* enable IKCONFIG_PROC to have access to /proc/config.gz
* increase dmesg buffer to 64KiB
* zero HOTPLUG_HELPER_PATH to work with udev versions more recent than 141
* enable PWM sysfs nodes
* enable AUTOFS4 for systemd
* enable FUSE

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>