boards: qemu_x86_nommu is a simulation platform

For some reason we dropped the simulation keyword and this platform is
not running any tests, we are just building the tests.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

boards/x86/qemu_x86/qemu_x86_nommu.yaml

@@ -2,6 +2,7 @@ identifier: qemu_x86_nommu
 name: QEMU Emulation for X86 (MMU disabled)
 type: qemu
 arch: x86
+simulation: qemu
 toolchain:
   - zephyr
   - xtools