Update sanitize property format

Change-Id: I2fd35d6d85c7da7e96ffcefcd81350c836f0db9c
diff --git a/libm/Android.bp b/libm/Android.bp
index 52249c9..27ea1c1 100644
--- a/libm/Android.bp
+++ b/libm/Android.bp
@@ -314,7 +314,9 @@
     system_shared_libs: ["libc"],
 
     native_coverage: bionic_coverage,
-    sanitize: ["never"],
+    sanitize: {
+        never: true,
+    },
 
     multilib: {
         lib32: {