target/tricore: Ensure not being build on user emulation

Currently only system emulation is supported.
Assert no target code is built for user emulation.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250121142341.17001-4-philmd@linaro.org>

target/tricore/cpu.h

@@ -26,6 +26,10 @@
 #include "qemu/cpu-float.h"
 #include "tricore-defs.h"
 
+#ifdef CONFIG_USER_ONLY
+#error "TriCore does not support user mode emulation"
+#endif
+
 typedef struct CPUArchState {
     /* GPR Register */
     uint32_t gpr_a[16];