aidl: fingerprint: Use soong to decide which arch to build

Some devices got 64bit kernelspace ported, but they need to use the
original 32bit HALs.

device.mk:
$(call soong_config_set,xiaomi_hardware_biometrics,run_32bit,true)

Change-Id: I5176147a4da3a8069bcfb35d64fdaa48e23190e2

aidl/fingerprint/Android.bp

@@ -5,8 +5,32 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+soong_config_module_type {
+    name: "xiaomi_hardware_biometrics_config_default",
+    module_type: "cc_defaults",
+    config_namespace: "xiaomi_hardware_biometrics",
+    bool_variables: [
+        "run_32bit",
+    ],
+    properties: ["compile_multilib"],
+}
+
+xiaomi_hardware_biometrics_config_default {
+    name: "xiaomi_hardware_biometrics_config_default",
+
+    soong_config_variables: {
+        run_32bit: {
+            conditions_default: {
+                compile_multilib: "64",
+            },
+            compile_multilib: "prefer32",
+        },
+    },
+}
+
 cc_binary {
     name: "android.hardware.biometrics.fingerprint-service.xiaomi",
+    defaults: ["xiaomi_hardware_biometrics_config_default"],
     relative_install_path: "hw",
     init_rc: ["android.hardware.biometrics.fingerprint-service.xiaomi.rc"],
     vintf_fragments: ["android.hardware.biometrics.fingerprint-service.xiaomi.xml"],