tests/functional: stabilize RK3588 ZVM boot

Signed-off-by: Chao Liu <chao.liu@processmission.com>

Author: zevorn

tests/functional/aarch64/test_rk3588_zvm.py

@@ -37,6 +37,7 @@ def boot_zvm_release(self, attempt):
 
         vm.set_console()
         vm.add_args('-accel', 'tcg',
+                    '-icount', 'shift=0,sleep=off',
                     '-smp', '8',
                     '-m', '1G',
                     '-drive',

tests/functional/aarch64/test_rk3588_zvm_linux_guest.py

@@ -289,6 +289,7 @@ def boot_zvm_linux_guest(self, base_image_path, attempt):
 
         vm.set_console()
         vm.add_args('-accel', 'tcg',
+                    '-icount', 'shift=0,sleep=off',
                     '-smp', '8',
                     '-m', '1G',
                     '-drive',