Add lvgl and fb examples for qemu-intel64.
NOTE: multiboot framebufer doesn't work with -kernel argument in QEMU,
NuttX image must be loaded with -cdrom argument.
QEMU command to run examples:
qemu-system-x86_64 -m 2G -cpu host -enable-kvm -cdrom disk.iso -serial mon:stdio
Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
