android/hal-bluetooth: Fix passing uninitialized mode on init
android/hal-bluetooth: Fix passing uninitialized mode on init

This fix following Valgrind report:
Syscall param sendmsg(msg.msg_iov[1]) points to uninitialised byte(s)
   at 0x534823D: ??? (syscall-template.S:81)
   by 0x5F68689: hal_ipc_cmd (hal-ipc.c:357)
   by 0x5F6240B: init (hal-bluetooth.c:437)
   by 0x4128C0: setup_base (android-tester.c:2594)
   by 0x40DDE5: setup_callback (tester.c:380)
   by 0x50803B5: g_main_context_dispatch (in /lib/x86_64-linux-gnu/
     libglib-2.0.so.0.3800.1)
   by 0x5080707: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3800.1)
   by 0x5080B09: g_main_loop_run (in /lib/x86_64-linux-gnu/
     libglib-2.0.so.0.3800.1)
   by 0x40EA0C: tester_run (tester.c:798)
   by 0x404475: main (android-tester.c:4864)
 Address 0x7ff0002b1 is on thread 1's stack

mapfau/bluez,silent-snowman/bluez,ComputeCycles/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,pkarasev3/bluez,mapfau/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,ComputeCycles/bluez,silent-snowman/bluez,pkarasev3/bluez,silent-snowman/bluez,pkarasev3/bluez,mapfau/bluez