Cuttlefish: pin cpp_std to gnu++17

This project doesn't build with gnu++20 and prevents AOSP default to be
upgraded to a newer standard. Once the build failure is fixed here, this
change can be reverted.

Bug: 311052584
Test: m checkbuild
Change-Id: Iff80bf2f86a16abc16dc215e587131971ce93948
diff --git a/host/commands/cvd_send_sms/Android.bp b/host/commands/cvd_send_sms/Android.bp
index d280cd6..03d48e8 100644
--- a/host/commands/cvd_send_sms/Android.bp
+++ b/host/commands/cvd_send_sms/Android.bp
@@ -19,6 +19,7 @@
 
 cc_defaults {
     name: "cvd_send_sms_defaults",
+    cpp_std: "gnu++17",
     shared_libs: [
         "libbase",
         "libcuttlefish_fs",