adb : add missing connection states

Both CS_RECOVERY and CS_SIDELOAD where not being checked by
connection_state_name which resulted in adb get-state returning
unknown when a device is in those modes.

Change-Id: I00716024d6a0bdb68d6e2380c8cd7b5d056bd15f
Signed-off-by: trevd <trevd1234@gmail.com>