qemu: Build qemu for Xtensa
qemu: Build qemu for Xtensa

Add Xtensa to the list of Qemus to build.

Change-Id: Ie0da06096d9085091750e41fbd14bd97e5810eee
Signed-off-by: Juro Bystricky <632519cd04f15aec8742590453c2132c1299a8ac@intel.com>

zephyrproject-rtos/meta-zephyr-sdk,zephyrproject-rtos/meta-zephyr-sdk,zephyrproject-rtos/meta-zephyr-sdk,zephyrproject-rtos/meta-zephyr-sdk