Completely migrate init first stage to Soong

adb_debug.prop is migrated too. And ramdisk_available is added to all
dependencies.

Bug: 187196593
Test: boot
Change-Id: I59cd149e0021211b8fd59c44b93bbf18dc8637bf
diff --git a/libmodprobe/Android.bp b/libmodprobe/Android.bp
index ba11dc9..525a880 100644
--- a/libmodprobe/Android.bp
+++ b/libmodprobe/Android.bp
@@ -8,6 +8,7 @@
         "-Werror",
     ],
     vendor_available: true,
+    ramdisk_available: true,
     recovery_available: true,
     srcs: [
         "libmodprobe.cpp",