qemy-system-aarch64-multiarch: Add --help support

--help may need to be passed in and should be directed to the main APU handler.

runqemu may use --help for various reasons.

Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>

Author: mhatle

meta-xilinx-core/recipes-devtools/qemu/files/qemu-system-aarch64-multiarch

@@ -28,6 +28,8 @@ elif '-plm-args' in APU_args:
     APU_args.remove(MB_args)
     MB_args = MB_args.split()
     mbtype='PLM'
+elif '--help' in APU_args:
+    mbtype='help'
 else:
     error_msg = '\nMultiarch not setup properly.'
     sys.exit(error_msg)