include serial arg on adb remount/root commands

When using adb with multiple devices connected, commands will fail if a device serial -s argument is not included. This argument will now be included in remount/root commands.

Bug: 340936628
Test: adevice -s <device port> (with multiple devices and tested device  needing to be remounted)
Test: atest

Change-Id: I0db8d99a4c5d5467bea0a1d7a28a2477eddfafda
1 file changed