Update escaping in Android.bp files

Strings like cflags in Android.bp files are parsed by blueprint,
written to build.ninja files, parsed by ninja, and then passed to
/bin/sh -c.  This had resulted in a combination of blueprint
(\"), ninja ($$), and shell (\$) escaping being necessary.

Soong has been updated to automatically handle ninja and shell
escaping, remove extra escaping from Android.bp files.

Bug: 31221587
Test: m -j
Change-Id: I82ef0e976d8c22474e84abd100fb467a425fdff1
diff --git a/bus/Android.bp b/bus/Android.bp
index 7ab773b..ee7ba1f 100644
--- a/bus/Android.bp
+++ b/bus/Android.bp
@@ -4,9 +4,9 @@
     cflags: [
         "-O3",
         "-DDBUS_COMPILATION",
-        "-DDBUS_DAEMON_NAME=\\\"dbus-daemon\\\"",
-        "-DDBUS_SYSTEM_CONFIG_FILE=\\\"/system/etc/dbus.conf\\\"",
-        "-DDBUS_SESSION_CONFIG_FILE=\\\"/system/etc/session.conf\\\"",
+        "-DDBUS_DAEMON_NAME=\"dbus-daemon\"",
+        "-DDBUS_SYSTEM_CONFIG_FILE=\"/system/etc/dbus.conf\"",
+        "-DDBUS_SESSION_CONFIG_FILE=\"/system/etc/session.conf\"",
         "-Wno-address",
         "-Wno-empty-body",
         "-Wno-pointer-sign",
diff --git a/dbus/Android.bp b/dbus/Android.bp
index 5d12346..a6e4780 100644
--- a/dbus/Android.bp
+++ b/dbus/Android.bp
@@ -63,9 +63,9 @@
         "-DDBUS_COMPILATION",
         "-DANDROID_MANAGED_SOCKET",
         "-DHAVE_MONOTONIC_CLOCK",
-        "-DDBUS_MACHINE_UUID_FILE=\\\"/etc/machine-id\\\"",
-        "-DDBUS_SYSTEM_CONFIG_FILE=\\\"/system/etc/dbus.conf\\\"",
-        "-DDBUS_SESSION_CONFIG_FILE=\\\"/system/etc/session.conf\\\"",
+        "-DDBUS_MACHINE_UUID_FILE=\"/etc/machine-id\"",
+        "-DDBUS_SYSTEM_CONFIG_FILE=\"/system/etc/dbus.conf\"",
+        "-DDBUS_SESSION_CONFIG_FILE=\"/system/etc/session.conf\"",
         "-Wno-empty-body",
         "-Wno-missing-field-initializers",
         "-Wno-pointer-sign",