The syscall livepatch selftest resolves and patches a syscall wrapper
symbol. To use that test for RISC-V livepatch validation, add the
RISC-V FN_PREFIX definition for ARCH_HAS_SYSCALL_WRAPPER.

Without this macro, the syscall livepatch selftest cannot resolve the
RISC-V target symbol, and the syscall-related livepatch test fails on
RISC-V.

Signed-off-by: Wang Han <redacted>
---
  .../testing/selftests/livepatch/test_modules/test_klp_syscall.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c b/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c
index dd802783ea84..275e4b10cf59 100644
--- a/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c
+++ b/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c

@@ -18,6 +18,8 @@
  #define FN_PREFIX __s390x_
  #elif defined(__aarch64__)
  #define FN_PREFIX __arm64_
+#elif defined(__riscv)
+#define FN_PREFIX __riscv_
  #else
  /* powerpc does not select ARCH_HAS_SYSCALL_WRAPPER */
  #define FN_PREFIX