accel/nvmm: Fix 'cpu' typo in nvmm_init_vcpu()

Fix typo to avoid the following build failure:

  target/i386/nvmm/nvmm-all.c: In function 'nvmm_init_vcpu':
  target/i386/nvmm/nvmm-all.c:988:9: error: 'AccelCPUState' has no member named 'vcpu_dirty'
    988 |     qcpu->vcpu_dirty = true;
        |         ^~

Cc: qemu-stable@nongnu.org
Reported-by: Thomas Huth <thuth@redhat.com>
Fixes: 2098164a6b ("accel/nvmm: Replace @dirty field by generic CPUState::vcpu_dirty field")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Tested-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20260113203924.81560-1-philmd@linaro.org>

target/i386/nvmm/nvmm-all.c

@@ -985,7 +985,7 @@ nvmm_init_vcpu(CPUState *cpu)
         }
     }
 
-    qcpu->vcpu_dirty = true;
+    cpu->vcpu_dirty = true;
     cpu->accel = qcpu;
 
     return 0;