[DNM] init: Spoof build type property to user

Also set release-keys and disable `ro.debuggable`. Avoids "root"
detection in some banking-related apps whilst having the convenience
of userdebug builds, such as adb root or permissive selinux.

Avoid this in eng build to keep necessary debugging intact.

Change-Id: I78ec5abe4db8083c0e02157c0bcd1a3d99fb9a5d

init/Android.bp

@@ -153,6 +153,7 @@ libinit_cc_defaults {
         },
         eng: {
             cppflags: [
+                "-DENG_BUILD",
                 "-USHUTDOWN_ZERO_TIMEOUT",
                 "-DSHUTDOWN_ZERO_TIMEOUT=1",
             ],

init/property_service.cpp

@@ -1366,6 +1366,12 @@ static void SetSafetyNetProps() {
     InitPropertySet("ro.boot.verifiedbootstate", "green");
     InitPropertySet("ro.boot.veritymode", "enforcing");
     InitPropertySet("ro.build.tags", "release-keys");
+
+#ifndef ENG_BUILD
+    // Spoof non-eng builds (such as userdebug) to user
+    InitPropertySet("ro.build.type", "user");
+    InitPropertySet("ro.debuggable", "0");
+#endif
 }
 
 void PropertyInit() {