drm: allow to build on 64bit only guest

Change-Id: If13e87b61c8e5efa447f494ff527478cf97175ff
diff --git a/drm/1.0/default/Android.bp b/drm/1.0/default/Android.bp
index 93b3278..d5063fb 100644
--- a/drm/1.0/default/Android.bp
+++ b/drm/1.0/default/Android.bp
@@ -46,7 +46,7 @@
 
 android_hardware_drm_1_0_multilib {
     name: "android.hardware.drm@1.0-multilib-lib",
-    compile_multilib: "32",
+    compile_multilib: "prefer32",
     soong_config_variables: {
         TARGET_ENABLE_MEDIADRM_64: {
             compile_multilib: "both",
@@ -56,7 +56,7 @@
 
 android_hardware_drm_1_0_multilib {
     name: "android.hardware.drm@1.0-multilib-exe",
-    compile_multilib: "32",
+    compile_multilib: "prefer32",
     soong_config_variables: {
         TARGET_ENABLE_MEDIADRM_64: {
             compile_multilib: "first",