Boards: QEMU: Replace -no-acpi with -machine acpi=off on x86 emulation.

QEMU 9.0 removes the `-no-acpi` option, which breaks emulation on x86
platforms when CONFIG_ACPI is not set. See:
https://github.com/zephyrproject-rtos/zephyr/issues/72191



This PR replaces `-no-acpi` with `-machine acpi=off`, as specified by
the QEMU documentation. It works on QEMU 8, but not been tested on
earlier versions.

Signed-off-by: Glenn Andrews <glenn.andrews.42@gmail.com>