perf: tests: Adapt mmap-basic.c for riscv

riscv now supports mmaping hardware counters to userspace so adapt the test
to run on this architecture.
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Ian Rogers <irogers@google.com>

tools/perf/tests/mmap-basic.c

@@ -284,7 +284,8 @@ static struct test_case tests__basic_mmap[] = {
 			 "permissions"),
 	TEST_CASE_REASON("User space counter reading of instructions",
 			 mmap_user_read_instr,
-#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
+#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
+			 (defined(__riscv) && __riscv_xlen == 64)
 			 "permissions"
 #else
 			 "unsupported"
@@ -292,7 +293,8 @@ static struct test_case tests__basic_mmap[] = {
 		),
 	TEST_CASE_REASON("User space counter reading of cycles",
 			 mmap_user_read_cycles,
-#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
+#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
+			 (defined(__riscv) && __riscv_xlen == 64)
 			 "permissions"
 #else
 			 "unsupported"