target/riscv: Do not include 'pmp.h' in user emulation

Physical Memory Protection is a system feature.
Avoid polluting the user-mode emulation by its definitions.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20210516205333.696094-1-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

target/riscv/cpu.h

@@ -97,7 +97,9 @@ enum {
 
 typedef struct CPURISCVState CPURISCVState;
 
+#if !defined(CONFIG_USER_ONLY)
 #include "pmp.h"
+#endif
 
 #define RV_VLEN_MAX 256