[vm] Migrate to newer fuchsia syscall

zx_task_suspend_token was deprecated in favor of the newer
zx_task_suspend API. This change migrates a use of the old API to the
newer one.

Tested: Build still succeeds.
Change-Id: I9965a3102a31fa0d1d7c3d2d58267e39b2f9a931
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/446180
Reviewed-by: Ryan Macnak <[email protected]>
Auto-Submit: Suraj Malhotra <[email protected]>
Commit-Queue: Ryan Macnak <[email protected]>

Author: surajrmal

runtime/vm/thread_interrupter_fuchsia.cc

@@ -37,7 +37,7 @@ class ThreadSuspendScope {
  public:
   explicit ThreadSuspendScope(zx_handle_t thread_handle)
       : thread_handle_(thread_handle), suspend_token_(ZX_HANDLE_INVALID) {
-    zx_status_t status = zx_task_suspend_token(thread_handle, &suspend_token_);
+    zx_status_t status = zx_task_suspend(thread_handle, &suspend_token_);
     // If a thread is somewhere where suspend is impossible, zx_task_suspend()
     // can return ZX_ERR_NOT_SUPPORTED.
     if (status != ZX_OK) {