[nce] handles duplicate NCE interrupts (#4530)

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md).
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------
Another crash observed in Ender Magnolia: A deadlock caused between CPUCore_0/GPU/GPUFencingThread.

CPUCore_0 waits for GPU work inside the NCE fault handler
GPU waits for the syncpoint mutex
GPUFencingThread holds that mutex while waiting for CPUCore_0 NCE interrupt lock

The fix makes duplicate interrupts return before acquiring the lock, while the first request keeps its original behavior.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4530
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>

src/core/arm/nce/arm_nce.cpp

@@ -369,8 +369,8 @@ void ArmNce::SetContext(const Kernel::Svc::ThreadContext& ctx) {
 }
 
 void ArmNce::SignalInterrupt(Kernel::KThread* thread) {
-    // Add break loop condition.
-    m_guest_ctx.esr_el1.fetch_or(static_cast<u64>(HaltReason::BreakLoop));
+    constexpr u64 break_loop = static_cast<u64>(HaltReason::BreakLoop);
+    if ((m_guest_ctx.esr_el1.fetch_or(break_loop) & break_loop) != 0) return;
 
     auto* params = &thread->GetNativeExecutionParameters();
     LockThreadParameters(params);