target/loongarch/cpu: Restrict "memory.h" header to sysemu

Missed in 0093b9a ("target/loongarch: Adjust functions
and structure to support user-mode") while cleaning commit
f84a2aa ("target/loongarch: Add LoongArch IOCSR instruction").

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221217172907.8364-4-philmd@linaro.org>

target/loongarch/cpu.h

@@ -12,7 +12,9 @@
 #include "fpu/softfloat-types.h"
 #include "hw/registerfields.h"
 #include "qemu/timer.h"
+#ifndef CONFIG_USER_ONLY
 #include "exec/memory.h"
+#endif
 #include "cpu-csr.h"
 
 #define IOCSRF_TEMP             0