boards: qemu_cortex_r5: Add a temporary hack to support CI testing.
boards: qemu_cortex_r5: Add a temporary hack to support CI testing.

This commit adds a temporary hack to support CI testing of the
qemu_cortex_r5 platform.

The Xilinx QEMU, required to run the tests for this platform, is
currently not available in the default SDK for CI (version 0.10.3) and
attempting to run any tests with the AArch64 QEMU included in this SDK
will cause failures (see #20217).

Since the latest SDK (version 0.11.0-alpha-8) has been added to the CI
image to allow initial testing, this hack automatically detects this
and uses the Xilinx QEMU for testing the qemu_cortex_r5 platform.

When the Zephyr SDK 0.11.0 is available as the default SDK for CI in
the future, this commit should be reverted.

Signed-off-by: Stephanos Ioannidis <dc76e9f0c0006e8f919e0c515c66dbba3982f785@stephanos.io>

finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr