x86: Use the same GDT when jumping to long mode

Make use the existing GDT which now includes entries for 64-bit code.
Leave the interrupt descriptors alone. They can be tidied up once U-Boot
starts up.

With this, kvm mode works with QEMU.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: https://source.denx.de/u-boot/custodians/u-boot-dm/-/issues/31
1 file changed