[core/arm/nce] suppress unused variable warnings (#4002)

Add `[[maybe_unused]]` to unused constants in the ARM NCE backend to suppress compiler warnings.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4002
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/core/arm/nce/arm_nce.cpp

@@ -388,7 +388,7 @@ void ArmNce::SignalInterrupt(Kernel::KThread* thread) {
     }
 }
 
-const std::size_t CACHE_PAGE_SIZE = 4096;
+[[maybe_unused]] const std::size_t CACHE_PAGE_SIZE = 4096;
 
 void ArmNce::ClearInstructionCache() {
 #ifdef __aarch64__

src/core/arm/nce/interpreter_visitor.cpp

@@ -12,9 +12,9 @@ namespace Core {
 
 namespace {
 // Prefetch tuning parameters
-constexpr size_t CACHE_LINE_SIZE = 64;
-constexpr size_t PREFETCH_STRIDE = 128; // 2 cache lines ahead
-constexpr size_t SIMD_PREFETCH_THRESHOLD = 32; // Bytes
+[[maybe_unused]] constexpr size_t CACHE_LINE_SIZE = 64;
+[[maybe_unused]] constexpr size_t PREFETCH_STRIDE = 128; // 2 cache lines ahead
+[[maybe_unused]] constexpr size_t SIMD_PREFETCH_THRESHOLD = 32; // Bytes
 } // namespace
 
 template <u32 BitSize>