client: request card-remove and sim-local when no bankd/slot is set

When the client leaves the OPERATIONAL state, do the inverse of what
happens when entering that state:
* request "card insert" no longer to be generated towards modem
* request switch back to local SIM
* reset the modem to notice the change

This way entering remote-sim operation due to adding a slotmap
and leaving remote-sim due to removing the slotmap should be
symmetrical.

Change-Id: Ifaa4b60474bf8585bfbe0288062f581821bd3faa
Closes: OS#5216
diff --git a/src/client/user_shell.c b/src/client/user_shell.c
index b22ee9a..5d37e97 100644
--- a/src/client/user_shell.c
+++ b/src/client/user_shell.c
@@ -20,11 +20,21 @@
 	return 0;
 }
 
+int frontend_request_card_remove(struct bankd_client *bc)
+{
+	return 0;
+}
+
 int frontend_request_sim_remote(struct bankd_client *bc)
 {
 	return 0;
 }
 
+int frontend_request_sim_local(struct bankd_client *bc)
+{
+	return 0;
+}
+
 int frontend_request_modem_reset(struct bankd_client *bc)
 {
 	return 0;