Change the /dev/gnss0 read logic, will send the CMD_GET_LOCATION to
/dev/gnss0 first.
launch_cvd --start_gnss_proxy --gnss_file_path=xxx
Test: Manually
Change-Id: Ic493790e80ceb6fd4d890b31e596b5c08addee40
Test: Added following kernel cmdline and tested on local CF
gnss_cmdline.serdev=serial8250/serial0/serial0-0
gnss_cmdline.type=0
serdev_ttyport.pdev_tty_port=ttyS1
Change-Id: I3766c31672aa91341403105759b2fd997e7f8879