qemu: add bbappend to tweak PACKAGECONFIG

qemu: add bbappend to tweak PACKAGECONFIG

Add a bbappend for qemu to tweak PACKAGECONFIG for target use to add
libusb support.  This is required for USB device passthrough for e.g.
touchscreen support.  Also enable libaio for potential performance
benefits and selinux support for investigation into leveraging it for
security improvement.

Bug-AGL: SPEC-4618

Change-Id: If9a52bad0657a04d7fc7da3ba15cd14be611ffd4
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
(cherry picked from commit cc422ba11f0a18b830422d41e47ba85481daa258)
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/28420
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>