selftests: riscv: Allow mmap test to compile on 32-bit

Macros needed for 32-bit compilations were hidden behind 64-bit riscv
ifdefs. Fix the 32-bit compilations by moving macros to allow the
memory_layout test to run on 32-bit.
Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Fixes: 73d05262 ("selftests: riscv: Generalize mm selftests")
Link: https://lore.kernel.org/r/20240808-mmap_tests__fixes-v1-1-b1344b642a84@rivosinc.comSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

tools/testing/selftests/riscv/mm/mmap_test.h

@@ -48,11 +48,11 @@ uint32_t random_addresses[] = {
 };
 #endif
 
-// Only works on 64 bit
-#if __riscv_xlen == 64
 #define PROT (PROT_READ | PROT_WRITE)
 #define FLAGS (MAP_PRIVATE | MAP_ANONYMOUS)
 
+// Only works on 64 bit
+#if __riscv_xlen == 64
 /* mmap must return a value that doesn't use more bits than the hint address. */
 static inline unsigned long get_max_value(unsigned long input)
 {
@@ -80,6 +80,8 @@ static inline unsigned long get_max_value(unsigned long input)
 	})
 #endif /* __riscv_xlen == 64 */
 
+#define TEST_MMAPS do { } while (0)
+
 static inline int memory_layout(void)
 {
 	void *value1 = mmap(NULL, sizeof(int), PROT, FLAGS, 0, 0);