cmake: emu: Allow overriding the qemu binary

The xlnx-zcu102 qemu machine is the only one that supports a Cortex-R
processor.  However, its main CPUs are Cortex A53s which requires the
aarch64 qemu binary to run.

Signed-off-by: Bradley Bolen <[email protected]>

Author: Bradley Bolen

cmake/emu/qemu.cmake

@@ -2,6 +2,8 @@
 
 if("${ARCH}" STREQUAL "x86")
   set_ifndef(QEMU_binary_suffix i386)
+elseif(DEFINED QEMU_ARCH)
+  set_ifndef(QEMU_binary_suffix ${QEMU_ARCH})
 else()
   set_ifndef(QEMU_binary_suffix ${ARCH})
 endif()